Hibiscus, Rose of Sharon, Shrub Althea 'Red Heart'

Hibiscussyriacus

Family
Malvaceae (mal-VAY-see-ee)
Genus
Hibiscus (hi-BIS-kus)
Species
syriacus (seer-ee-AK-us)
Synonym
Spacing
8-10 ft. (2.4-3 m)
Hardiness
4-6 ft. (1.2-1.8 m)
Sun Exposure
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)
Bloom Color
Sun to Partial Shade
Bloom Time
Foliage
Red
White/Near White
Other Details
Other details
Mid Summer
Late Summer/Early Fall
Propagation Methods
Deciduous
This plant is resistant to deer
Seed Collecting
Soil pH requirements
From woody stem cuttings
From softwood cuttings
From semi-hardwood cuttings
From hardwood cuttings
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Patent Information
Foliage Color
Allow pods to dry on plant; break open to collect seeds
Bloom Characteristics
Water Requirements
Where to Grow
Regional

This plant is said to grow outdoors in the following regions:

Tuscaloosa, Alabama

Carmichael, California

Crockett, California

Deland, Florida

Fort Walton Beach, Florida

Conyers, Georgia

Bloomington, Illinois

Chicago, Illinois

Saint Cloud, Minnesota

Saucier, Mississippi

Jefferson City, Missouri

Blair, Nebraska

Kearney, Nebraska

Lincoln, Nebraska

Auburn, New Hampshire

Jersey City, New Jersey

Willingboro, New Jersey

Croton On Hudson, New York

Cleveland, Ohio

Dayton, Ohio

Dundee, Ohio

Glouster, Ohio

Painesville, Ohio

Westerville, Ohio

Hulbert, Oklahoma

Oakland, Oregon

Clairton, Pennsylvania

Coatesville, Pennsylvania

Lebanon, Pennsylvania

Pittsburgh, Pennsylvania

Greenville, South Carolina

Greeneville, Tennessee

Jackson, Tennessee

Summertown, Tennessee

Talbott, Tennessee

Arlington, Texas

Longview, Texas

North Zulch, Texas

San Antonio, Texas

Santa Fe, Texas

South Jordan, Utah

Cathan, Washington

John Sam Lake, Washington

Langley, Washington

North Marysville, Washington

Priest Point, Washington

Shaker Church, Washington

Stimson Crossing, Washington

Weallup Lake, Washington

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Featured Videos

Gardener's Notes:

3
positives
0
neutral
0
negative
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S
Lebanon, PA (Zone 6a) | June 2011 | positive

This plant provides a great hedge border for privacy. I love all the different colors it provides. Does anyone know how to keep all the l...Read More

W
W
Hulbert, OK (Zone 7a) | September 2004 | positive

Indeed a gorgeous beauty well deserving of a pruning
to encourage those gorgeous blooms in larger sizes!
A stunning althaea...Read More

O
Dundee, OH (Zone 5b) | June 2004 | positive

Grows easily from seed. Can be kept pruned to fit a smaller space if required without harming the plant. Very fast grower! Also blooms la...Read More

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