Title: Lagerstroemia cultivars under evaluation at the University of Florida/IFAS Agricultural Research and Education Center - Monticello
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Title: Lagerstroemia cultivars under evaluation at the University of Florida/IFAS Agricultural Research and Education Center - Monticello
Physical Description: Book
Creator: Knox, Gary W.
Publisher: Agricultural Research and Education Center, IFAS, University of Florida
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Bibliographic ID: UF00076544
Volume ID: VID00001
Source Institution: University of Florida
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Resource Identifier: oclc - 153960200

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CtQ '[AREC-Monticello Research Report BB 90-1 Central0 '

LAGERSTROEMIA CULTIVARS UNDER EVALUATION Library f
AT THE UNIVERSITY OF FLORIDA/IFAS
AGRICULTURAL RESEARCH AND EDUCATION CENTER MONTIdYL ti

Gary W. Knox and Jeffrey G. Norcini UliVrs ;t Of
AREC-Monticello
Route 4, Box 4092
Monticello, Florida 32344-9302


Many new cultivars of Lacerstroemia spp. have been released

in the past few years. Homeowners, landscapers, and nursery

growers are now faced with a large number of crape myrtle

cultivars from which to choose. To our knowledge, most of these

cultivars are not being publicly evaluated in USDA Zones 8 or 9.

Thanks to the generosity of local and regional nurseries, the

AREC-Monticello has initiated a planting of Lagerstroemia

cultivars that will allow us to evaluate new cultivars and
compare them to older cultivars for their adaptability to the

north Florida south Georgia area.

Table 1 lists the 35 cultivars of crape myrtle

(Lagerstroemia species) that are planted on 2 sites at the AREC-

Monticello. Four plants of each cultivar (except those

indicated) have been planted over the past 2 years (2 plants of

each cultivar on each site). Initial size of the plants ranged

from 1-gallon containers to 6-foot-tall bare-root plants.

The plantings feature many of the cultivars released by Dr.

Donald Egolf of the National Arboretum in Washington, D.C. These

cultivars have been specially selected for their ornamental

characteristics such as autumn color, bark characteristics, and









plant habit, as well as flower color. Many of these cultivars

also are noted for their resistance to powdery mildew.

We also have plants from the "Dixie" series of cultivars

developed by David Chopin of Louisiana. The "Dixie" cultivars

reportedly grow less than 5 feet tall and are promoted for use as

small shrubs or groundcovers.

The cultivars in our plantings are grouped by mature size as

classified by Egolf and Andrick (The Lagerstroemia Handbook/

Checklist, 1978): dwarf = less than 3 feet; semi-dwarf = 3 to 6

feet; medium = 6 to 12 feet; and, tall = 12 feet or more. Plants

are grouped in rows spaced 20 feet apart except for dwarf

cultivars which are 5 feet apart. Individuals are spaced within

rows according to their size classification: dwarf plants are 8

feet apart, semi-dwarf plants are 10 feet apart, medium plants

are 15 feet apart, and tall plants are 20 feet apart.

The plantings are intended to simulate a low-maintenance

landscape. Plants are not irrigated but are mulched with 3 to 4

inches of coarse pine bark. The plantings receive minimal

fertilization of 2 lbs. nitrogen/1000 ft2 per year. Pesticides

are applied as needed and, in 1989, pest control consisted of 1

application of Bacillus thuringiensis on August 17 to control

caterpillars and 1 application of an insecticidal soap on

September 10 to control aphids.

Plant height and spread are recorded monthly during the

growing season, and aphid and powdery mildew infestations are

evaluated periodically. Other characteristics that are being

recorded include date of first flower, length of flowering









season, autumn color, time of leaf drop, and bark

S characteristics. Beginning next year, we hope to issue annual

reports on the growth and ornamental characteristics of these

cultivars.











Table 1. Cultivars of Lagerstroemia spp. being evaluated at the
AREC-Monticello.

CULTIVAR SIZE GROUP1

Acoma S-D
Apalachee M
Baton Rouge D
Bayou Marie D
Biloxi T
Bourbon Street D
Byers Wonderful White n.a.
Carolina Beauty M
Comanche M
Cordon Bleu D
Country Red2 T
Dallas Red T
Delta Blush D
Hope2 S-D
Hopi2 S-D
Lafayette D
Lipan M
Miami T
Natchez T
Near East M
New Orleans D
Osage M
Pecos S-D
Potomac T
Regal Red T
Royalty D
Seminole M
Sioux M
Tonto S-D
Tuscarora T
Tuskegee T
Twilight T
Victor D
Yuma M
Zuni S-D

1 D dwarf; S-D semi-dwarf; M medium; T tall; n.a. not
available.
2 Less than 4 plants are being evaluated.




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