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Rose of Sharon, Shrub Althea 'Helene'

Hibiscus syriacus

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


6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 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:


White/Near White

Bloom Time:

Mid Summer

Late Summer/Early Fall



This plant is resistant to deer

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

From seed; direct sow after last frost

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Bag seedheads to capture ripening seed

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored

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

Requires consistently moist soil; do not let dry out between waterings

Where to Grow:

Unknown - Tell us


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

Tuscaloosa, Alabama

Chowchilla, California

Placerville, California

Sherman, Connecticut

Chicago, Illinois

Plainfield, Illinois

Winamac, Indiana

Cleveland, Ohio

Dundee, Ohio

Salem, Oregon

Richmond, Texas

Spicewood, Texas

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Gardeners' Notes:


On Aug 25, 2005, vossner from Richmond, TX (Zone 9a) wrote:

Beautiful plant. I have two which I'm training into standards. Low maintenance, blooms profusely from May-Dec.
Sep 2009. Still growing them as standards, but have not been able to achieve a compact canopies.


On May 22, 2005, misskaffee from BeachTown, CA (Zone 10a) wrote:

I purchased this plant last year and love it! In my zone-7b backyard, it was a prolific bloomer all last summer in white hibiscus-flowers with shocking pink centers. It seemed to thrive in the hot Georgia sun and wasn't phased at all by the poor clay-mud soil.
I'd read that the Helene is far hardier than other hibiscus plants, but wasn't confident it would survive the winter outside last year. -But it did!! It filled out beautifully in early spring looking full, healthy, and vibrantly green. I can't wait for the blooms!

I must confess, though, the only reason I purchased it in the first place was that it shares the name of my dear grandmother, Helene. I knew nothing else about it (or any other type of hibiscus) at that time. I just trusted that, with a name ... read more


On Jun 2, 2004, OhioBreezy from Dundee, OH (Zone 5b) wrote:

Grows easily from seed, can be pruned to any size you would like to keep it. Blooms later in season when all other shrubs seem to have quit blooming.