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Group Title: Bulletin - University of Florida Agricultural Extension Service ; 168 B
Title: Hibiscus in Florida
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Title: Hibiscus in Florida
Series Title: Bulletin - University of Florida Agricultural Extension Service ; 168 B
Physical Description: Book
Language: English
Creator: Dickey, R. D
Publisher: gricultural Extension Service, University of Florid
Publication Date: 1965
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Table of Contents
    Historic note
        Historic note
    Front Cover
        Page 1
    Table of Contents
        Page 2
    Main
        Page 3
        Page 4
        Page 5
        Page 6
        Page 7
        Page 8
        Page 9
        Page 10
        Page 11
        Page 12
        Page 13
        Page 14
        Page 15
        Page 16
        Page 17
        Page 18
        Page 19
        Page 20
        Page 21
        Page 22
        Page 23
        Page 24
        Page 25
        Page 26
        Page 27
        Page 28
        Page 29
        Page 30
        Page 31
    Reference
        Page 32
Full Text





HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida







Bulletin 168B April 1965

AGRICULTURAL EXTENSION SERVICE
GAINESVILLE, FLORIDA




Hibiscus in Florida

By R. D. DICKEY
Horticulturist, Florida Agricultural Experiment Stations

Fig. 1.-Young hibiscus plant (variety Apex) in heavy bloom.





















CONTENTS
Page


CHINESE HIBISCUS ................ .... ..... .. -.... 3


VARIETIES ................................-- ---- --------------- --- -.... 3

Variety List--------------------------------------------------- ------- 13
Variety List ................ .... ... .......----- ..... -- -- 13


LANDSCAPE USES .............-...... --.------........---- -- ---------- 18


PROPAGATION .............--------....-..--. ----- -----.------- -- ---- -19


SOILS AND CLIMATE ...................................------ --- --- -- ------ 23

TIME OF PLANTING .................--.------------------------------ 24

PREPARATION OF SOIL ........~.. ~....-........--. .......-----. 24

PLANTING ............................ -------..------------------------ 24


CULTIVATION AND FERTILIZATION .--............-----------.. --.. ---- ---- .---. 25


FLOWER BUD DROP .............-------........ ....... ------------- -----....-.-- 27

OTHER SPECIES .................. --- --......-------------------- -------- 28

REFERENCES -.......------------------------------ 32











COOPERATIVE EXTENSION WORK IN AGRICULTURE AND HOME ECONOMICS
(Acts of May 8 and June 30, 1914)
Agricultural Extension Service, University of Florida,
Florida State University and United States Department of Agriculture, Cooperating
M. O. Watkins, Director










Hibiscus in Florida


By R. D. DICKEY

The Malvaceae or mallow family is composed of a number of
genera familiar to many. The genus Malvaviscus contains the
red-flowered ornamental shrub called turks cap or waxmallow,
and the genus Althea has the well known hollyhock. A third
member of the family is the genus Hibiscus, from which the
cultivated hibiscus gets its name.
Several species or kinds of Hibiscus are grown in Florida
both for food and as ornamental plants. The only one of the
group which is commonly called by its generic name, however, is
Hibiscus rosa-sinensis L., the common cultivated form known
generally as the Chinese hibiscus or rose of China (Fig. 1).

Chinese Hibiscus
Hibiscus rosa-sinensis L., the Chinese hibiscus, is probably
the most popular and widely planted shrub in tropical areas of
the world. It is a native of China but came to us by way of
Hawaii and possibly other tropical countries. There is perhaps
no other flowering shrub in existence today that matches it in
range in size and shape of flowers and in the innumerable com-
binations and shades of color.
The Chinese hibiscus has been grown in Florida for many
years but with the introduction of new varieties, particularly
those in shades of yellow, its popularity has increased tremen-
dously until it is now one of the most widely planted shrubs in
the southern half of the peninsula.

Varieties
Present-day forms of hibiscus are very variable. Although
there is an almost unlimited variation observed in shades of
colors, there are only four primary colors in addition to white
which are concerned in the color pattern of the flowers, namely,


ACKNOWLEDGMENTS: The author expresses his thanks to those
individuals who contributed information helpful in the preparation of this
bulletin. Particular thanks are due the late Norman A. Reasoner for his
valuable assistance in compiling the variety list.
This bulletin was originally printed as Bulletin 467, Florida Agricultural
Experiment Stations.







Florida Agricultural Extension Service


red, yellow, orange and purple. Petals vary in shape from linear
to almost round; some have wide bases and others very narrow
ones. They are also quite variable in width and length.


44


Fig. 2.-Flower and foliage of the Chinese hibiscus variety Psyche, an
old favorite. The petals are reflexed, with wavy edges showing H.
schizopetalus parentage.

The leaves of different varieties are even more variable. All
forms are found from long and narrow to almost round, some
with entire margins and some with deeply lobed serrate margins.
Some are hairy and rough, others softly pubescent and others
smooth and shiny.







Hibiscus in Florida


In size and habit of growth varieties range from low-growing
dwarf shrubs to large shrubs or small trees to 20 or more feet in
height. Some have whip-like growth while others are densely
covered with foliage throughout. The hibiscus is an evergreen,
but some varieties have less leaves at certain seasons than others.


II-


Fig. 3.-Flower and foliage of a single-flowered Chinese hibiscus. The
flower is salver-form or saucer-shaped.







Florida Agricultural Extension Service


There are three general shapes assumed by hibiscus flowers.
The fringed hibiscus from East Africa, Hibiscus schizopetalus,
and all hybrids of this parent have more or less recurved petals
with wavy, scalloped edges (Fig. 2). In the vast majority of
varieties, which now number into the hundreds, the flower when
fully open is salver-formed or saucer-shaped (Fig. 3). The third
group, containing many of the newer varieties, has flowers that
remain funnel-shaped until they wilt (Fig. 4).


Fig. 4.-Flower of the Chinese hibiscus variety Glorious B. The flower
is funnel-shaped.

Nearly all hibiscus flowers open early in the morning and
begin to wilt in late afternoon. The great majority are one-day
bloomers, though a few varieties will retain their blossoms in
good condition two days. Blossoms usually last longer in cold
weather than during hot summer days. The blooming season
for most varieties is nearly year around; however, blossoms are
more plentiful during the period of most vigorous growth, which
is usually during late spring, summer and early fall.
Hibiscus flowers are becoming increasingly popular for use
in flower arrangements in the home. Flowers to be used in the






Hibiscus in Florida


evening should be cut, just after they have opened, early in the
morning and kept in the refrigerator until time to use them.


J.~

A- Ni


K


Fig. 5.-Brilliantissimus (Single Scarlet) is probably the most widely
planted variety of Chinese hibiscus in Florida.
No artificial key has been prepared for identifying varieties.
They are grouped for convenience on the basis of flower form
into single (Figs. 1, 2, 3, 4, 5, 6, 7), semi-double (Fig. 8), and
double (Figs. 9, 10), and on the basis of color into white, pink,








8 Florida Agricultural Extension Service

red, salmon, orange, yellow, lavender to purplish and multi-
colored. Many varieties are difficult to place in any color group
because they are composed of shades of two or more colors.
Though many varieties are definitely single or double in form,
practically all gradations in between these groups are to be

Fig. 6.-Mrs. Earl Anthony is an excellent single yellow variety of
Chinese hibiscus.







Hibiscus in Florida


found. The semi-double group is arbitrarily considered here as
those varieties having flowers with a single row of true petals
(five) with petaloids on the staminal column (Fig. 8).


is- *
S^
KS-'7


m


Fig. 7.-Flower and foliage of the Chinese hibiscus, Hendry Single Orange
(Hendry Y-11).
The growing interest in hibiscus during the past several
years has resulted in the development of many new varieties in
Florida and other states where they are grown and new varieties
have been brought in from Hawaii and other tropical countries.
There is some confusion relative to the correct origin and name
of many varieties now in cultivation. Every attempt should be
made by nurserymen and others interested to discard those va-
rieties which do not merit propagation and to standardize the
names, as quickly as possible, of meritorious varieties.


\


Ibc.
lirrl 1,
IS







Fig. 8.-The variety Stella Lykes, an example of the semi-double group,
has petaloids on the staminal column.


p~9 1


* I


r 7I


*.ht


"er


111111111 110 11V NIM








Hibiscus in Florida


All varieties of Hibiscus rosa-sinensis and hybrids having this
species as one parent are considered here as Chinese hibiscus.
The need for standardization of varietal nomenclature is
now being filled to a considerable extent by official nomenclature


Fig. 9.-Flower and foliage of Flamingo Plume, an excellent double-
flowered Chinese hibiscus variety.


P rri


........ ......








Florida Agricultural Extension Service


Fig. 10.-Flower and foliage of a double-flowered yellow variety of
Chinese hibiscus.

list of the American Hibiscus Society (1).1 It gives the origin
and a brief description of the flowers of a large number of va-
rieties grown in Florida. This list also gives brief information
about the vigor of growth, foliage and growth habits of some
varieties. Descriptions of varieties listed here have been taken,
for the most part, from the "Florida Hibiscus Bulletin" by N. A.
Reasoner (27). There are several hundred named varieties and
more are introduced each year. Some of the better varieties for
planting in Florida, representative of various forms and color
groups, are given below:

1Italic figures in parentheses refer to "List of References" on Page 32.








Hibiscus in Florida


Variety List

SINGLE FLOWERS

White
1. Bride-Very. large flowers. Apple-blossom pink, fading to
white.
2. Ruth Wilcox (Purity)-Large, fragrant flowers. Pure white
with crimson staminal column.
3. Snow White-Large flowers. Pure white.
4. White Wings-Pure white, red fringed eye.

Pink
1. Agnes Gault--Very large flowers. Satiny pink.
2. Betty Chalk-Brilliant violet-pink.
3. Bridesmaid-Very large flowers. Brilliant light rose.
4. Carolyn Wilson-Deep rich pink. Sport of Helen Walker.
5. Dainty (LaFrance)-Small flowered, profuse bloomer. Sat-
iny pink.
6. Eleanor Atherton-Very large ruffled petals. Light pink
with crimson eye.
7. Ethel Smith-Ruffled petals. Bright rose.
8. Helen Walker-Ruffled, overlapping petals. Light salmon
pink.
9. Mrs. Mary Johnson-Very large flowers. Creamy pink with
a lighter eye.
10. Painted Lady-Medium flowers with overlapping petals.
Rose pink, heavily veined in pale pink. Style blood red to
cream with orange stigma.
11. Velvet Touch-Large flowers. Bright rose flecked with
white.
Red
1. Brilliantissimus (Single Scarlet)-Brilliant scarlet.
2. Eugenia Goldsmith-Medium-sized flowers. Light red.
3. Florida Sunset (Andersons No. 132)-Red with yellowish
edge.
4. Pearl Harbor-Dark scarlet, large lavender star in center.
5. Prince Takamatsu-Very large flowers with thin, recurved
petals. Light scarlet.
6. Psyche-Small flowers with ruffled, reflexed petals. Very
dark red.







Florida Agricultural Extension Service


7. Valencia Flame-Petals strongly reflexed. Brilliant orange-
scarlet.
Salmon
1. Betty Kersey-Golden-salmon. Sport of Mrs. Mary John-
son.
2. Eleanor Gartley (King of Tonga)-Bright salmon. Sport
of Agnes Gault.
3. Euterpe-Buff with reddish eye.
4. Fair Jeanette-Orange-salmon with white center and pink
at base of staminal column.
5. Mrs. Lowery (Rose Dawn)-Very large flowers with over-
lapping petals. Buff with light pink center.

Orange
1. Apex-Medium to large flowers. Orange-yellow with pink
veins and reddish pink center.
2. Connie Vereen-Very large flower. Apricot-yellow with
light center.
3. Entwistle Cross-Immense flat flowers. Light orange shad-
ing to bright carmine at center.
4. Hendry Single Orange (Hendry Y-11)-Golden orange.
5. Latin Rhythm-Swarthy wine color.
6. Margaret McKenzie-Large flowers. Overlapping ruffled
petals. Deep orange, light center shading to carmine eye.
7. McIntyre-Large flowers. Reddish orange, white zone.
8. Neutrality-Brilliant orange-vermilion.
9. Perfection-Very large flowers. Orange and gold.

Yellow
1. Buttercup-Clear yellow.
2. California Gold-Large flowers. Light yellow with pink
eye.
3. Daisy Entwistle-Very large flowers. Yellow, flushed pink
with red eye.
4. Karna-Lemon yellow shading to large white center.
5. Kilawiai-Bright chrome yellow with light pink markings
in throat.
6. Mandalay-Very large flowers. Yellow with large white
center and purplish pink eye.
7. Martha Olive Parnell-Large flat flowers with ruffled petals.
Rich gold, distinct carmine eye.







Hibiscus in Florida


8. Mrs. Earl Anthony-Clear picric yellow.
9. Old Gold-Large flowers. Old gold shading to violet-rose
center.
10. Superba-Very large flowers. Yellow upon opening, changes
to golden yellow, with large white star in center.
11. Tonggs Golden-Large flowers. Golden yellow.

Multicolored
1. Ann Baldwin-Light claret, petals with gold edges and tips.
2. Fig Leaf-Large flowers. Buff with purplish-pink to dark
purple center.
3. Glorious B-Large flowers. Brilliant burnt orange, with
glowing cadmium red throat.
4. Jungle Queen-Vivid dark orange, with maroon eye bor-
dered with lavender carmine.
5. Kamapauuaa-Large flat flower. Fawn, with purplish-pink
center.
6. Red Gold-Large flowers. Golden, overlaid with brilliant
scarlet. From Hawaii.

DOUBLE FLOWERS
White
1. Andersons No. 10--White flushed with pale pink. Tall,
upright growing plant.
2. Baby Doll-Very large flowers. Ivory satin-white faintly
flushed pink in center.
3. Double White-Loose, irregular double flowers. White,
flushed pink in cool weather.
4. Helen Johnson-Large flowers. White, faint pinkish cast.

Pink
1. American Beauty-Deep rose, shaded violet.
2. Columbia-Bright rose, color of the Columbia rose. Colors
deeper in cool weather.
3. Hurricania-Loose petals, bright pink.
4. Kona-Large flowers. Bright silver pink.
5. Mary Morgan-Very large flowers. Light pink.
6. Peachblow-Peach pink with dark maroon throat.
7. Sea Shell-Large flowers. Light shrimp pink.







Florida Agricultural Extension Service


Red
1. Andersons Yellow Red-Light red with yellow tinge.
2. Double Spanish Red-Orange red.
3. Floradora-Very large red-orange flowers.
4. John Paul Jones-Very large flowers, loose petals. Dark
ox-blood.
5. King Kalakaua (Burgundy, Monarch)-Very large flowers.
Dark wine red.
6. Lamberti (Double Blood Red)-Blood red.
7. Poinsettia Red-Dark velvety red.
8. Valencia Special-Light pinkish terra-cotta. The primary
petals are reflexed, the center petals are crinkly.

Salmon
1. Cavalier-Lavender-pink, shaded with cream.
2. Duchess-Large flowers. Yellow and pink.
3. Flamingo Plume-Flowers the color of flamingo plumage.
4. Florence Kuhn-Flamingo-pink sport of Hurricania.

Orange
1. Bruce Parnell-Very large flowers. Brilliant orange-red
with yellow undertone.
2. Charles James, Jr.-Basal petals reddish-orange, center 5-
parted, mingled reddish-orange and gold.
3. Douglas MacArthur-Orange.
4. Dr. J. G. Dupuis-Flowers very large. Brilliant light
orange-red overlaid with lighter tones.
5. Fleda Hughes-Very large flowers. Flowers 5-parted, light
mahogany with gold reverse on primary petals.
6. Jane Cowl-Orange sport of Peachblow.
7. Jigora-Large flowers. Orange with crimson and vermilion
at base of petals.
8. Sara De Shazo-Glowing reddish orange.

Yellow
1. Crown of Bohemia-Very large flowers. Golden yellow,
shading to amber and bronze at the center.
2. Hawaiian Golden-Large flowers. Bronze with light center.
3. Hilo Island-Pale yellow.
4. Mrs. C. D. Anderson (Andersons No. 161)-Medium-sized
flowers. Golden yellow.







Hibiscus in Florida


5. Mrs. James Hendry-Large, fragrant flowers. Light yel-
low with white center.
6. Mrs. Thomas A. Edison-Yellow with peach-colored center
in morning, fading to clear yellow in afternoon.
7. Princess Margaret-Golden yellow, shading to white at base
of petals.
8. Queen Esther-Canary yellow faintly touched with cherry
red at base of petals.
9. Sungold (Hendry No. 40)-Medium-sized flowers. Dark
gold with a darker center.
Lavender to Purplish
1. Dolores Del Rio-Medium flowers. Purplish with a dark
center.
2. Myrna Loy-Lavender fading to bluish lavender with age.
Multicolored
1. Eddie-Multicolored yellow with red throat.
2. Golden Harvest-Two-toned orange-bronze.
3. Mrs. W. W. White (Talisman)-Medium-sized flowers. Two-
toned coloring similar to that of Talisman rose. Yellow to
reddish orange.
4. Neapolitan-Large flowers. Light pink and white with yel-
low tipped petals.

SEMI-DOUBLE FLOWERS
1. Anna Hose-Large flowers. White, faint orchid shading.
2. Nan Patterson-Large flowers. True petals light cream,
shading to orchid in center, orchid veining. Cream petaloids
on staminal column.
3. Nanette Peach-Sport of Hurricania. Ruffled petals and
petaloids. Petals shell pink blending to lighter pink, pink
style.
4. Ruth Stuart Allen-Bright rose to coral pink tipped petals,
white throat. Orange stigma pads. Back of petals cream
colored.
5. Semi-Double Apricot (Andersons No. 315)-Petals and pet-
aloids pinkish-orange-apricot, with deeper veining.
6. Sharron Bell-Single row of true petals with petaloids on
the staminal column. Light claret with gold edges and tips
on the petals.
7. Stella Lykes-Medium-sized flowers. A single row of true
petals with petaloids on the staminal column. Orange salmon.







Florida Agricultural Extension Service


Landscape Uses
Hibiscus is one of the most popular ornamental shrubs for
landscape planting in Florida, in the areas where it is adapted.
Ease with which it can be grown, attractive evergreen foliage,
the long, almost continuous blooming season, quick recovery
when killed to the ground by cold and wide range in form and
color of the flowers are factors contributing to this popularity.
Hibiscus is excellent landscape material because it may be
used for a variety of purposes. It is used for foundation or base
plantings, which includes the use of columnar varieties such as
Dainty (LaFrance), Lutea, Andersons No. 10 and Jane Withers
as "accent point" plants, as individual specimens or in groups
of two or more as "standards" for terrace or formal use, as one
of the elements in an informal shrubbery border (Fig. 11) and
as an informal flowering hedge.
When planting in groups or for a hedge, use varieties similar
in character of growth and appearance of leaves. Too much con-
trast will produce a very ragged and unpleasing effect. Varie-
gated-leaved varieties, such as Matensis and Cooperi, may be
effectively used in group plantings, however, to provide a pleas-
ing contrast. Dense-branching varieties such as Brilliantissimus
(Single Scarlet), Florida Sunset, Euterpe, Betty Chalk, Peach-
blow and American Beauty, are best for hedges. The hibiscus

Fig. 11.-Hibiscus used as one of the elements in a shrubbery border.








Hibiscus in Florida


should not be sheared to formal shape but should be cut back
just enough to keep the plants dense and well shaped.
While the plant itself is well adapted to full sun, some va-
rieties tend to fade their blossom color slightly when exposed to
direct sunlight and this should be taken into account when fitting
the various varieties into the landscape. As a rule the lighter
colored varieties, such as pink and yellow, fade more than the
reds and salmons in bright sunshine. This change in color is
not always attributable to sunlight alone. It has been observed
that the shade of color of some varieties may change somewhat
as the plant grows older, resulting sometimes in a darker flower
and sometimes in a lighter flower by the time the plant reaches
two or three years of age.
There is an ever-increasing consciousness of the desirability
of organized community beautification programs in Florida. One
phase of such a program includes park, street and roadway plant-
ings. Hibiscus is excellent for this and can be used to advantage,
especially when combined with palms or other ornamental trees.

Propagation
Hibiscus may be propagated by seeds, cuttings, air layering
or marcottage, division, budding and grafting.
Cuttings.-Most varieties of hibiscus can be readily propa-
gated by softwood cuttings. Tip cuttings of half-ripened wood,
taken from May through July, will usually give best results.
Cuttings will usually root in about six weeks and the plants pro-
duced from them will generally begin to flower in about nine
months. The leaf-bud cutting method is used for increasing
rare varieties where there is a shortage of propagating material.
It is now standard nursery procedure to grow the rooted cuttings
to salable size in containers such as pots, cypress boxes or in
1, 4 or 5 quart or larger cans (Fig. 12). They may be lined out
in the nursery row, however, and later handled as "balled and
burlapped" plants.
Air Layering or Marcottage.-Varieties that are difficult to
root by cuttings can usually be increased readily by air layering
or marcottage. Air layering may be done at any time during the
year but rooting takes place most readily during the spring and
summer months. A recently developed method, which involves
the use of a moisture-proof plastic wrapper, has greatly im-
proved the ease and efficiency of this method of propagation.
Branches about 1/2 inch or larger in diameter are girdled at a







Florida Agricultural Extension Service


point approximately 12 to 18 inches below the tip, by removing a
strip of bark from 1/2 to 1 inch long. A ball of moist sphagnum
moss 5 to 6 inches in length and 3 to 4 inches in diameter is
placed over the girdled area and wrapped with a sheet of mois-
tureproof rubber plastic wrapper and tied securely at each end
with either rubber bands or string (Fig. 13). Fasten a piece
of newspaper or wrapping paper loosely over the wrap to prevent
the sphagnum from over-heating and birds from picking holes
in the wrap. Roots form in the sphagnum moss usually within
six or eight weeks. The branch can then be cut off below where
the roots have formed and set as a new plant.


Fig. 12.-Three popular hibiscus containers-empty oil can,
cypress plant box and clay flower pot.










Fig. 13.-Steps in making an air layer on a hibiscus branch, using a
moisture-proof plastic wrapper. Top, branch girdled-the first step in the
operation. Middle, wrapper in place and moist sphagnum moss placed over
girdled area. Bottom, ends of wrap have been twisted tight and tied with
rubber bands, completing the operation.


No. F661 STuDENTs PocKrx RULER


N- -.6(1 -iu








Florida Agricultural Extension Service


Rootstocks.-Many varieties are benefited by budding or
grafting to a vigorous, strong-growing rootstock. Some varie-
ties used as rootstocks are Brilliantissimus (Single Scarlet),
Dainty (LaFrance), Euterpe, Pink Versi-color and Painted Lady,
which is one of the preferred rootstocks on the lower East Coast.
Any other variety that experience has shown is easy to root, is
strong-growing and tolerant to injury by root-knot and the root-
rot fungus, would be satisfactory as a rootstock.


Fig. 14. Shield-bud on
hibiscus tied in place with a
rubber band, left. Budding
knife, right.








Hibiscus in Florida


The rootstock is propagated by cuttings which, when rooted,
are potted in cans or pots and are grafted or budded with the
desired variety when they have reached the proper stage. The
plants thus produced are grown to salable size in the original
containers. Both buds and grafts usually come into flower in
the fall if the operation is performed in the spring.
Budding.-Shield-budding is the method most used and has
given best results when performed in the spring; however, it
may be done at any time the bark will slip readily. An inverted-T
incision is made in the rootstock 2 to 3 inches from the ground.
The bud is cut in the form of a shield, about an inch long, and
inserted in the incision in the stock. It is tied in place with either
rubber budding strips or budding tape (Fig. 14).
Grafting.-The methods of grafting most generally used
in propagating hibiscus are whip-grafting and side-grafting.
Whip-grafting has been most successful when done during
the spring months. More recently the side-graft, as used on
avocados, has proven promising. It has been most successful
when done during late spring and summer, but may be done at
any time. Use young, succulent understock the size of a pencil
or slightly larger. Make a long, sloping cut diagonally down into
the stock. Cut a wedge on the lower end of the scion and insert
it in the slot on the stock in such a way that all of the cut por-
tion is enclosed and the cambium of stock and scion meet. Tie
securely with a rubber band or soft waxed string and cover with
paraffin or grafting wax.
Take bud and graft wood from the current season's growth
that has hardened enough to require definite pressure to bend
shoots.
Seed.-Because seed very seldom produce plants true to the
variety from which they came this method of propagation is not
generally recommended, except for those individuals interested
in developing new varieties. Plants grown from seed usually
require about 18 months for the production of blossoms.

Soils and Climate
The hibiscus is well adapted to a wide range of soil conditions.
It grows well on sand, muck, marl or rockland, if sufficient plant
food is provided. A physiological disorder, evidenced as a chlo-
rosis of the leaves, is common on hibiscus plants growing on the
calcareous soils of the coastal areas and is especially troublesome







Florida Agricultural Extension Service


on the limerock soils of the Miami-Homestead area. The plant
requires plenty of moisture for best growth but should be
planted only in well-drained locations.
The principal factor limiting the growing of hibiscus in
Florida is climate. Since the above-ground parts of the plant
are usually killed back by temperatures below 28 to 30 degrees
F., its use is generally restricted to the southern half of the
peninsula. In this general area there will be winters when
hibiscus will experience some cold injury. It is not dependable
landscape material in northern Florida, as it is frequently killed
to the ground. However, established plants usually come out
again in the spring and bloom on the new growth that summer.

Time of Planting
Most of the young hibiscus plants produced by nurseries or
the home gardener in Florida are grown in cans or pots, though
some are planted in the nursery row and later dug and moved
with a ball of earth about the roots. Handled either way, they
may be planted at any time during the year, if given proper care.

Preparation of the Soil
Proper preparation of the soil previous to planting will help
insure vigorous healthy plants and reduce the problem of after
care. Usually the location where the plants are to be set should
be prepared some time in advance of planting. Most sand and
marl soils are low in organic matter and hibiscus plants are ben-
efited by the addition of this material. Mark off the area where
the plant is to be set and spread from four to six inches of com-
post, peat, leafmold or well-decomposed manure over it and work
in. A handful or two of commercial fertilizer may be added to
advantage and completes the preparation for planting.

Planting
Soil preparation should be completed prior to the receipt of
the plants so that planting can begin immediately upon their ar-
rival. In setting either container-grown or "balled and bur-
lapped" plants, dig a hole slightly larger than the ball of earth
about the roots in the prepared location. Set the plants at the
same depth they were in the containers or nursery row. This can
easily be done by first setting the container in the hole and then
adjusting the depth of the hole so that the surface of the soil in







Hibiscus in Florida


the container is even with the ground level. Carefully remove
the plant from the container, taking care not to disturb the ball
of earth about the roots, and set it in the hole. Fill in around the
ball with the soil previously taken from the hole and water thor-
oughly. Follow the same procedure with balled plants. It is
not necessary to remove the burlap from about the ball; how-
ever, it should be cut away at the top of the ball or turned back
so that the ground line, which indicates the proper depth at
which the plant should be set, may more easily be determined.
Container-grown and balled plants usually require no prun-
ing at time of planting. Large plants growing in the nursery
may require some pruning, to compensate for loss of roots, if
moved during the summer months.
Leave a shallow basin around each plant to facilitate watering
later, if it is needed. It takes several months for newly trans-
planted plants to grow an extensive root system. Such plants
should be adequately watered during drought periods for several
months following transplanting. After a strong root system has
developed the plants are better able to care for themselves during
droughts but should not be allowed to suffer for lack of water.

Cultivation and Fertilization
Hibiscus plants will usually present an attractive appear-
ance and bloom well if vigorous healthy growth is encouraged
by proper care, which includes cultivation and fertilization.
An area around the plant should be kept cultivated to reduce
competition from grass and weeds for moisture and plant food.
Lawn grass should not be allowed to encroach upon the cultivated
area. To prevent this, frequent edging will be necessary during
the growing season of the grass. The cultivated area should be
gradually enlarged as the plant increases in size.
Best results are obtained by making sure that an abundance
of plant food is present. This is best accomplished by the use of
both organic and commercial fertilizers.
Organic matter, an important constituent of the soil, is
usually low in the mineral soils of Florida and may become
further depleted in soils under cultivation. It is difficult to re-
place humus where it cannot be incorporated by turning the
soil. Areas where ornamental plants, such as hibiscus, are grow-
ing cannot be so worked. This makes it especially desirable to
incorporate considerable amounts or organic matter in the soil
before planting and to keep the plants mulched.







Florida Agricultural Extension Service


The hibiscus is attacked by the root-knot nematode but is
classed as tolerant to its injury. Some varieties, however, show
the effects of nematode injury more than others. Susceptible
plants, such as hibiscus, grown under a mulch are less severely
injured than unmulched plants.
Hibiscus plants should be banked during the winter months
to protect the lower framework of the plant, in those areas of
the state where they are subject to cold injury. This is especially
necessary for grafted or budded plants; otherwise they may be
killed back below the bud or graft union and the top lost.
To promote and maintain healthy, vigorous growth, it is
usually necessary to fertilize regularly. For this purpose ferti-
lizers containing from 4 to 8 percent nitrogen, 6 to 8 percent
phosphoric acid and 4 to 8 percent potash should be satisfactory.
The amount to apply will vary with the age of the plants, the
fertility of the soil and the quantity of organic matter supplied,
but may range from approximately one ounce (3 tablespoonsful)
for a small plant to four pounds (about 2 quarts) for a large
plant per application. Newly set plants may not require ferti-
lizer the first season if the soil has been properly prepared before
planting, but, under some conditions, it may be advisable to give
them a light application of fertilizer three or four months after
planting. Periodic fertilization should be given from the second
season on. In the southern half of the peninsula, where hibiscus
grow practically the year around, three applications per year
should be given, the first in late winter or early spring, the sec-
ond in mid-summer and the third in late summer or early fall.
The fertilizer may be applied broadcast over the surface of
the mulch and washed in with water from a hose. Applying the
fertilizer in punch bar holes probably gives a more efficient utili-
zation of the plant food but requires much more labor.
A nutritional disorder of hibiscus, evidenced as a chlorosis
of the leaves, is common on plants growing on calcareous soils of
the coastal areas; however, it also occurs on acid sandy soils.
This chlorosis is especially persistent and acute on hibiscus plants
growing on the limerock soils of the Miami-Homestead area.
In some cases, soil applications of manganese sulfate and
iron chelate alone or together to chlorotic hibiscus plants grow-
ing on alkaline sands have materially improved foliage conditions
and seem worth trying. The amount of manganese sulfate to
apply will vary with severity of symptoms and size of plants but
will range from 1/8 to 1 pound per plant. On alkaline soils it is







Hibiscus in Florida


desirable to mix an equal amount of sulfur with the manganese
sulfate. Chelated iron should be applied according to the man-
ufacturer's directions. The condition of the plants will deter-
mine the need for further applications. Plants growing on the
limerock soils of the Miami-Homestead area, however, generally
do not respond to soil applications of manganese sulfate. The
cause of this malnutrition trouble is not known, but past experi-
ence with other lime-induced chloroses points to the beneficial
effects obtained from the use of liberal amounts of acid muck,
peat or compost in preparing the soil for planting and to the
desirability of using an organic mulch. Also, the use of soil
acidifying materials, such as sulfur, in combination with micro-
elements such as manganese, iron, zinc and magnesium which,
with the exception of magnesium, are usually relatively unavail-
able to the plant under these soil conditions, may be helpful in
some cases.
A nutritional spray containing iron, manganese and zinc ap-
plied two or three times during the year has, in certain instances,
considerably improved the condition of chlorotic plants. The
iron-manganese-zinc-lime spray is prepared by dissolving 1
ounce each of iron sulfate, manganese sulfate and zinc sulfate
in 21/2 gallons of water. Then take 11/ ounces of finely ground
hydrated lime, make into a paste with water and add to the
solution while stirring vigorously. Effectiveness of the spray
may be increased by adding a small amount of suitable spreader.
The mixture should be used immediately after it is made.

Flower Bud Drop
Under certain conditions some varieties of hibiscus either fail
to open or drop their flower buds. The degree to which this
takes place is quite variable but, at times, it may noticeably re-
duce the flowering of affected varieties.
Plants that are unhealthy because of insect or nematode at-
tack or a deficiency of one or more of the plant food elements
may drop flower buds prematurely. Injury to unopened flower
buds by aphids and thrips can cause bud drop. Poor drainage
or excessive drought may cause plants to drop flower buds. The
shock of transplanting may cause plants to drop flower buds.
Flower bud drop appears to be a decided varietal character-
istic; that is, some varieties under the same growing conditions
will drop or fail to open flower buds while other varieties grow-
ing nearby consistently open their flowers.







Florida Agricultural Extension Service


Other Species of Hibiscus
The fringed hibiscus, Hibiscus schizopetalus Hook., which
came to us from East Africa, is a large evergreen shrub that re-
sembles the Chinese hibiscus in general appearance of foliage.
It differs from H. rosa-sinensis in that it has more slender, droop-
ing branches and pendulous flowers whose strongly reflexed
petals are beautifully fringed (Fig. 15). Coral is the variety
most planted. Numerous hybrids resulting from crossing the
fringed and Chinese hibiscus are in cultivation in Florida. This


Fig. 15.-Flower and foliage of the fringed hibiscus, Hibiscus schizopetalus.







Hibiscus in Florida


species is climatically adapted to the same areas in the state and
is handled in the same manner as the Chinese hibiscus.
Shrub-althea, or rose-of-sharon, Hibiscus syriacus L., is a
large deciduous shrub which is native to eastern Asia. It is
hardy in the northern states and is grown as far south as
northern Florida, where it is used to a limited extent as an
ornamental. The general appearance of the foliage and shape
of the flowers are similar to that of some varieties of the Chinese
hibiscus (Fig. 16). There are several varieties which give
flowers ranging in color from white through shades of pink, red,
purple and violet, in single and double forms. Hibiscus syriacus
has been crossed with H. rosa-sinensis and some of the resulting
progeny suggest the possibility of a new color group with flowers
which will have shades of lavender and purple. The shrub-althea
is susceptible to the root-knot nematode and is apparently more
severely injured by it than is the Chinese hibiscus. It is de-
ciduous and should be planted during the winter months only.
The sea hibiscus or mahoe, Hibiscus tiliaceus L., came to
us from the Hawaiian Islands, although it occurs scattered
throughout the Old World tropics, where it is native. It is a
small evergreen tree with large leathery leaves and hibiscus-like
yellow flowers (Fig. 17). It is tender and is climatically adapted
to extreme southern peninsular Florida and the Keys.
The red-leaf hibiscus, Hibiscus acetosella Welw. ex Hiern.,
native to western tropical Africa, is seen in gardens throughout
the state, but is not hardy in northern Florida. It is a shrub up
to 8 feet in height. The branches and 5-lobed leaves are magenta
red but in some forms the leaves and stems are green or light
red. The flowers, borne in November and December, are usually
magenta red but some forms are either yellow or dusky cream
with rose-tinged veins, and have red petal spots (23).
A close relative of the red-leaf hibiscus, Hibiscus radiatus
Cav., native of India, Burma, Malay Peninsula and Australia,
is also found in gardens throughout Florida. The stems and
palmately lobed leaves with serrate margins, are green or light
red. The flowers, appearing in September and October, are vari-
able in color and may be cream, yellow, pink, rose, red or purple
with deep-red basal spots (23). It is an annual but is usually
perpetuated by volunteers.
Cotton-rose or confederate-rose, as it is often called, Hibiscus
mutabilis L., is also a native of China. It is a large evergreen
shrub or small tree. It has large, 3 to 5-lobed leaves and large


























Iqi~











,c~~ i~.







Hibiscus in Florida


-4-Fig. 16.-Flowers and foliage of the shrub-althea, Hibiscus syriacus.


flowers which open white or pale pink in the morning but be-
come deep red by night. Like Chinese hibiscus, it is semi-hardy
and is climatically adapted to only southern half of the state.
Perennial Hibiscus (Rosemallows)-Several hibiscus species
and their hybrids, having herbaceous, deciduous stems and thick-
ened, fibrous, perennial roots fall in this group.
The common rosemallows (garden mallows) are thought to
be hybrids of three native species, Hibiscus palustris L. (H.
moscheutos L.), H. coccineus Walt. and H. militaris Cav. (22).
They are cold hardy and may be grown throughout Florida. Gar-
den mallows are large herbaceous perennials which grow to
8 to 10 feet in height. Large hibiscus-like flowers are produced
during the summer months. Several varieties are available
which give flowers ranging in color from white and cream
through shades of pink and red, often with a red eye in the
throat. Usually propagated by seed but desirable varieties
should be increased by division and cuttings.


Fig. 17.-Flower and foliage of the sea hibiscus or mahoe,
Hibiscus tiliaceus.









Florida Agricultural Extension Service


List of References
1. American Hibiscus Society official hibiscus list, pp. 135, 1955.
2. Bailey, L. H. The standard cyclopedia of horticulture. The Macmillan
Co. 1922.
3. Bailey, L. H. The manual of cultivated plants. The Macmillan Co.
1949.
4. Bass, Clarence A. Your hibiscus and how to grow them. Amer. Hort.
Mag. 35: 4: 207-213. 1956.
5. Charles, Hoyt. A study of synonymy in Chinese hibiscus in Florida.
1950. Unpublished thesis Fla. Agr. Exp. Sta. Library.
6. Dickey, R. D. Flower bud drop of Chinese hibiscus. Fla. Florist and
Nurseryman 2: 8: 8. 1950.
7. Dunaway, Harry. Bud dropping in hibiscus. Tropical Homes and Gar-
dening 1: 11: 12. 1951.
8. Evans, Hugh. Hawaiian hibiscus. Home Gardening 7: 10: 235-236.
1947.
9. Fifield, W. M. Hibiscus, its place in Florida gardening. Ornamental
gardening in Florida-No. 56: 187-190. Mimeographed, Fla. Agr.
Exp. Sta. 1937.
10. Gast, Ross H. Improving the hibiscus. Fla. Florist and Nurseryman
2: 8: 4-6. 1950.
11. Gilbert, Minnie. New hibiscus, the garden's gay deceiver. Sun-Up
2: 8: 13, 33. 1947.
12. Goulding, Harry R. You can create new hibiscus blossoms. Floriland
1: 10: 4-5, 20. 1951.
13. Goulding, Harry R. Rooting hibiscus cuttings. Floriland 1: 11: 4-5,
21. 1951.
14. Goulding, Harry R. Try grafting hibiscus this easy method. Flori-
land 1: 12: 5-6. 1951.
15. Gregory, Luis E. and J. van Overbeck. An analysis of the process of
root formation on cuttings of a difficult-to-root hibiscus variety.
Proc. Amer. Soc. Hort. Sci. 46: 427-433. 1945.
16. Hanchey, R. H. and W. D. Kimbrough. Hibiscus for the yard. Louisi-
ana Bul. 489. 1954.
17. Higbee, Harry A. Hibiscus hybridizing. Tropical Gardening 1: 6: 8.
1951.
18. Holmes, Jack O. Hibiscus-new treasure for southern gardens. Home
Gardening. 9: 5: 100-101, 117. 1949.
19. Holmes, Jack O. Hibiscus the wonder flower in Florida. Sub Tropical
Gardening 4: 2:,3, 11. 1950.
20. James, M. 0O. Foot-rot of hibiscus reported in Louisiana. Tropical
Gardening 1: 7: 10. 1951.
21. McConnell, L. S. The hibiscus-its history, culture and uses. Tropi-
cal Gardening 1: 1:5, 20. 1950.
22. McFadden, Jr., S. E. New hybrids of american hibiscus spp. Proc.
Fla. State Hort. Soc. 68: 366-369. 1955.
23. Menzel, Margaret Y. and F. D. Wilson. Chromosomes and crossing
behtivior of Hibiscus cannabinus, H. acetosella and H. radiatus.
Amer. Jour. Bot. 48: 8: 651-657. 1961.
24. Morton, Julia F. and R. Bruce Ledin. Four hundred plants of south
Florida. Text House. 1952.
25. Nakasone, Henry Y. and Richard A. Hamilton. Four new hibiscus
varieties. Univ. Haw. Agr. Exp. Sta. Cir. 35. 1952.
26. Reasoner, N. A. The hibiscus in Florida. Proc. Fla. State Hort. Soc.
61: 300-302. 1948.
27. Reasoner, N. A. The Florida hibiscus bulletin. Fourth Edition, Jan-
uary 1, 1952, Mimeographed. Filed Fla. Agr. Exp. Sta. Library.
28. Ruhl, Ralph. Proper planting deemed all-important for hibiscus.
Tropical Homes and Gardening 1: 12: 12. 1951.
29. Simpson, C. P. Ornamental gardening in Florida. J. J. Little and
Ives Company. 1926.
30. Wilcox, E. V. and V. S. Holt. Ornamental hibiscus in Hawaii. Hawaii
Agr. Exp. Sta. Bul. 29. 1913.




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