Rose mallow (Hibiscus moscheutos) is common along roadsides and ditchbanks in Louisiana. It has been hybridized to have flowers that are up to a foot across.
Another favorite hibiscus is Texas star hibiscus (Hibiscus coccineus). It is similar in appearance (at least the foliage) to mari- juana. Flowers are bright red on tall stems. It flowers less prolifically than tropical hibiscus.
hibiscus foliage can occur when insecticides are applied.
Several other hibiscus are common to Louisiana landscapes. One of the other popular hibiscus species is althea, also called Rose of Sharon. Althea (Hibiscus syriacus) has limited flower performance, but is a great plant to withstand our winter growing conditions. It also makes a nice background plant in a landscape bed. New varieties that have improved flower perfor- mance are available.
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Allen D. Owings, Associate Specialist (Horticulture)
Louisiana State University Agricultural Center, William B. Richardson, Chancellor Louisiana Cooperative Extension Service, Jack L. Bagent, Vice Chancellor and Director
Issued in furtherance of Cooperative Extension work, Acts of Congress of May 8 and June 30, 1914, in cooperation with the United States Department of Agriculture. The Louisiana Cooperative Extension Service provides equal opportunities in programs and employment.
Failure to Bloom
One of the most common questions is, “Why don’t my plants bloom?” Here are a few possibilities:
improper irrigation management (too wet, too dry, irregular watering)
too much shade
excessive nitrogen fertilization
root system is not restricted
thrip or similar insect damage to flower buds
Confederate rose (Hibiscus mutabilis) is popular in south Louisiana. Plants can reach 15 to 20 feet tall. The woody stems usually do not die back during winters unless severe conditions are present. Flow- ers of Confederate rose begin the day as white. By early afternoon, the flowers are light pink, and by evening, flowers are a rosy pink.