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Rose of Sharon, Shrub Althea

ID

2901-1066

Authors as Published

Alex X. Niemiera, Associate Professor, Department of Horticulture

(Hibiscus syriacus)

Summary:

Foliage: Deciduous broadleaf

Height: 10 feet

Spread: 6 feet

Shape: Upright

Rose-of-Sharon is a large shrub with showy. Relatively large single or double flowers bloom in summer. Flower colors include white, red, purple, violet, and blue.

Plant Needs:

Zone: 5 to 8

Light: Partial shade to full sun

Moisture: Moist to dry

Soil Type: Sandy, loam, or clay

pH Range: 3.7 to 7.3

Functions:

Suggested uses for this plant include border and mass plantings.

Planting Notes:

Transplants readily.

Tolerates wide range of soil pH.

Salt tolerant.

Care:

Blooms occur on current year's growth, so prune in early spring before new growth starts.

Remove one-third of the wood, including the oldest branches and any weak growth, at ground level, annually.

Problems:

Aphids are a problem on new growth.

Susceptible to spider mites in hot, dry locations.

Other problems include leaf spots, blights, Japanese beetle, and white fly.

Will self sow and produce populations of seedlings in the vicinity of the parent plant(s).

Alternatives:

Consult local garden centers, historic or public gardens and arboreta, regarding cultivars and related species that grow well in your area.

There are numerous cultivars of H. syriacus in the trade. Cultivars of Hibiscus syriacus:

`Blue Bird' has blue flowers.

`Diana' has white flowers that do not produce viable seed.

`Helene' has white flowers with a reddish-purple base.

Comments:

This is a large shrub which flowers in late summer when few other shrubs are in bloom.

Single or double flowers range in color from white to red to blue to all colors in between.

Unless older portions of the plant are pruned regularly, the flowers will decrease in size.

 

This material was developed by Carol Ness as part of the Interactive Design and Development Project funded by the Kellogg Foundation.

Rights


Virginia Cooperative Extension materials are available for public use, re-print, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.

Publisher

Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Alan L. Grant, Dean, College of Agriculture and Life Sciences; Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; Jewel E. Hairston, Administrator, 1890 Extension Program, Virginia State, Petersburg.

Date

May 1, 2009


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