Rose of Sharon, Shrub Althea 'Hamabo'

Hibiscus syriacus

Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Hibiscus (hi-BIS-kus) (Info)
Species: syriacus (seer-ee-AK-us) (Info)
Cultivar: Hamabo
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8-10 ft. (2.4-3 m)


4-6 ft. (1.2-1.8 m)


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:


Maroon (Purple-Brown)

Bloom Time:

Mid Summer

Late Summer/Early Fall




Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

From seed; stratify if sowing indoors

From seed; germinate in a damp paper towel

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Allow seedheads to dry on plants; remove and collect seeds

Foliage Color:


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:

Tuscaloosa, Alabama

Merced, California

Box Springs, Georgia

Calhoun, Georgia

Hampton, Illinois

Moline, Illinois

Attleboro, Massachusetts

Buffalo, New York

Cleveland, Ohio

Dundee, Ohio

Happy Valley, Oregon

Pittsburgh, Pennsylvania

Fort Worth, Texas

Falls Church, Virginia

Richmond, Virginia

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Gardeners' Notes:


On May 18, 2005, Gindee77 from Hampton, IL (Zone 5a) wrote:

This ROS is a great bloomer and survives our zone 5 winters just fine.


On Dec 30, 2004, brandnewgirl133 from Box Springs, GA wrote:

This is a great plant to grow!It seems to love the heat that we have here,and doesn't need much water to grow.The flowers are huge,and a beautiful shade of purple.They last for a long time,also.The seeds are very easy to collect,and they are also easy to sow.They grow very fast.This is a great plant for people who live in the South,and have very hot summers and cool winters.


On Jan 6, 2004, OhioBreezy from Dundee, OH (Zone 5b) wrote:

I love how fast this shrub grows here for me, little seedlings that germinate one spring will flower for me in the second spring, often times on small 1 foot tall little plants. They bloom profusely and are a sight to see all open at once, if you don't want seeds to save or seeds to drop, AND unless you have a thick layer of mulch, YOU MUST snip off the dead flowers or they will reseed everywhere under the mamma plant. They come true from seed. Overall, I love it in my gardens and wouldn't trade it for anything :)