Historic note

Group Title: Bradenton GCREC research report - University of Florida Gulf Coast Research and Education Center ; BRA1988-25
Title: Scheduling lisianthus (Eustoma grandiflorum) production
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00065232/00001
 Material Information
Title: Scheduling lisianthus (Eustoma grandiflorum) production
Series Title: Bradenton GCREC research report
Physical Description: 3 leaves : ; 28 cm.
Language: English
Creator: Harbaugh, B. K ( Brent Kalen )
Gulf Coast Research and Education Center (Bradenton, Fla.)
Publisher: Gulf Coast Research and Education Center, IFAS, University of Florida
Place of Publication: Bradenton FL
Publication Date: 1988
Subject: Flowers -- Varieties -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
Bibliography: Includes bibliographical references (leaf 2).
Statement of Responsibility: Brent K. Harbaugh.
General Note: Caption title.
General Note: "November, 1988"
 Record Information
Bibliographic ID: UF00065232
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 63682365

Table of Contents
    Historic note
        Historic note
        Page 1
        Page 2
        Page 3
Full Text


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

site maintained by the Florida
Cooperative Extension Service.

Copyright 2005, Board of Trustees, University
of Florida


5007 60th Street East
'"J Of ,;'4a Bradenton, Fl 34203

Bradenton GCREC Research Report BRA1988-25 November 1988

Brent K. Harbaughl

A great deal of confusion exists concerning scheduling lisianthus for
year-round production in Florida. Research from various parts of the
United States indicated that length of time from sowing to flowering was
six months (1,2,3). Reports from several producers in Florida indicated
that production time was extremely variable ranging from 4-8 months. Some
;producers noted that plants often remained vegetative at certain times of
the year and developed a rosette growth habit. The purpose of this
research was to determine the natural flowering cycle for lisianthus when
produced .under southwest Florida conditions.
Materials and Methods

Seeds of cultivar Blue Poppy were sown on the 15th of each month for one
year. Germination and the first month of seedling growth was in a
controlled environment room with temperatures ranging from 72-765F and
light intensity of 125-150 foot candles. After one month, seedlings were
transplanted into 1.5 x 1.5 inch cell transplant flats and grown for an
additional 4-5 weeks in a glass greenhouse. These plants were then
transplanted into 4.5 inch square pots and grown to flowering in the same
greenhouse. The greenhouse was cooled with a fan-and-pad system and
exterior paint was applied to further reduce temperatures. Light
intensity ranged from 3000-5000 foot candles. High daily temperatures
generally ranged from 80OF winter to 950F summer, and night temperatures
ranged from 600F winter (supplemental heat provided ) to 750F summer.

Media used for germination and seedling stage, transplant stage and for
final production in 4.5 inch pots was a volume mix of 4 parts Canadian
peat: 2 horticultural grade vermiculite: 1 builders sand: 1 perlite
amended on a cubic yard basis with 5 lbs dolomite, 9 Ibs hydrated lime,
4.5 Ibs calcitic lime and 1.5 Ibs [Micromax minor element mixture. ,Media
pH was 6.5-6.8. Seedlings were fertilized once per week and transplants
twice per week with a 200 ppm N-P205-K20 solution. Potted plants were
fertilized with 100 ml of a 550 ppm N-500 ppm P205-750 ppm K20 solution
once or twice per week depending on plant size. Data was recorded from 10
plants per sowing date and included number of days from sowing to first
opened flower, number of flower buds at flowering, and height of plant
from pot rim to the tallest flower.

1Professor of Floriculture.

Results and Discussion

A quick glance at the data in Table 1 reveals the reasons for the
confusion that exits with scheduling lisianthus. The number of days from
sowing to flowering ranged from 103 to 300 days. Seeds sown in October,
November, December, January and February produced plants which flowered in
May. For June and July sowing dates, half the plants flowered from
106-133 days while the rest developed a rosette growth habit and did not
flower until May, 270-300 days from sowing. For the August sowing, the
flowering time was extremely variable ranging from 180 to 270 days with a
few plants flowering each month from February through May.

In general, the longer the time from sowing to flowering the greater the
number of flowers and plant height. The differences in growth habit were
so great that one would not think plants produced from seeds sown in
different months were the same cultivar. Those plants which developed a
rosette growth habit (June or July sowings) would have been suitable for a
six inch pot by the time they flowered. Of course, the length of time to
flower these plants would make this impractical to consider. The highest
quality plants (considering vegetative and flowering characteristics for a
4.5 inch pot) were those from January-March sowings. Plants from these
sowing dates had the least range in length of time to flower, adequate
flower number for a 4.5 inch pot and would need very little growth
retardant for a proper pot-to-shoot ratio.

In summary, the success and acceptance of lisianthus as a new crop for
Florida's flower industry has been hindered by the lack of information
available for this crop. Although the popularity of and demand for
lisianthus have been great, production problems with scheduling and
variabililty in plant quality have lessened its appeal with commercial
producers. The data presented in this paper illustrate the dramatic
effects of sowing dates on production time and plant growth
characteristics. Photoperiod and temperature during production probably
played a role in erratic flowering patterns. Current research to gain
information to improve scheduling and plant quality for year-round
production is focusing on response of seedlings to photoperiod
manipulation and temperature. Until this research is completed, the data
in Table 1 may be used as a guideline for scheduling lisianthus.

Literature cited

1. Halevy, A. H. and A. M. Kofranek. 1984. Evaluation of lisianthus as
a new flower crop. HortScience 19(6):845-847.

2. Roh, M. and R. Lawson. 1984. The lure of Lisianthus. Greenhouse
Manager 2(11):103-104, 108, 110, 112-114, 11G-121.

3. Tjia, B. and T. J. Sheehan. 1986. Chemical height control of
Lisianthus russellianus. HortScience 21(1):147-148.

Table 1. Influence of sowing date on vegetative
characteristics of lisianthus (Eustoma
4.5 inch pots.

and flowering

produced in

Month Days from Flower buds Plant
seeds Month most sowing to flowering per plant height
sown plants flowered (mean) (range) (Number) (inches)

January May 126 119-133 37 14

February May 117 111-121 50 17

March June 103 100-106 27 13

April July 102 95-115 25 15

May September 113 103-120 25 12

June September 106 96-124 15 15

or May* 330 222-342 60 26

July December 133 129-154 30 12

or May* 300 286-328 50 24

August Feb.-May* 218 169-258 35-108 20-28

September April 223 207-232 80 22

October May 201 193-212 90 24

November May 183 174-199 90 22

December May 168 159-183 28 11

*For June and July sowings, half the plants developed a rosette growth
habit and did not flower until the following year. For the August
sowing, plants flowered sporadically from February thru May without a
majority of the plants flowering in any month. The greater the time to
flower, the greater the number of flowers and plant height.

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