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Rose of Sharon, Shrub Althea 'Double Purple'

Hibiscus syriacus

Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Hibiscus (hi-BIS-kus) (Info)
Species: syriacus (seer-ee-AK-us) (Info)
Cultivar: Double Purple
» View all varieties of Hibiscus


8-10 ft. (2.4-3 m)


Unknown - Tell us


USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Sun to Partial Shade

Bloom Color:


Bloom Time:

Mid Summer

Late Summer/Early Fall




Other details:

Unknown - Tell us

Soil pH requirements:

4.5 or below (very acidic)

4.6 to 5.0 (highly acidic)

5.1 to 5.5 (strongly acidic)

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:

Unknown - Tell us

Propagation Methods:

From herbaceous stem cuttings

From woody stem cuttings

From softwood cuttings

From semi-hardwood cuttings

Seed Collecting:

Unknown - Tell us

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


This plant has been said to grow in the following regions:

Cabot, Arkansas

Inverness, Florida

Chillicothe, Illinois

Danvers, Massachusetts

Oxford, Michigan

Waynesboro, Mississippi

New Bern, North Carolina

Cleveland, Ohio

Lafayette, Tennessee

Center, Texas

San Antonio, Texas (2 reports)

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Gardeners' Notes:

No details have been posted.