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Hardy Hibiscus, Rose Mallow, Swamp Mallow 'Plum Crazy'

Hibiscus moscheutos

Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Hibiscus (hi-BIS-kus) (Info)
Species: moscheutos (mos-KEW-tos) (Info)
Cultivar: Plum Crazy
Additional cultivar information:(PP11854)
Hybridized by Zwetzig-Fleming
Registered or introduced: 1999
» View all varieties of Hibiscus


36-48 in. (90-120 cm)


24-36 in. (60-90 cm)

36-48 in. (90-120 cm)


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)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun

Bloom Color:

Medium Purple

Bloom Time:

Mid Summer

Late Summer/Early Fall

Blooms repeatedly



Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:


Propagation Methods:

From herbaceous stem cuttings

From softwood cuttings

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

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:

San Jose, California

Aurora, Colorado

Orange Park, Florida

Farmersburg, Indiana

Greenville, Indiana

Florence, Mississippi

Forked River, New Jersey

Baldwinsville, New York

Cincinnati, Ohio

Haviland, Ohio

Bristol, Pennsylvania

Cookeville, Tennessee

Copperas Cove, Texas

Iola, Texas

Jacksonville, Texas

Oakhurst, Texas

Temple, Texas

Manassas, Virginia

, Walloon Region

Eau Claire, Wisconsin

Sauk City, Wisconsin

show all

Gardeners' Notes:


On Jan 13, 2014, tumorgrrrrl from McKinney, TX wrote:

Those who are trying to trade seeds or cuttings of this plant should know that it is patented (PP 11854), which means that even trading of this plant for free is prohibited. I don't know the developers, I'm just a firm believer in copyright, whatever it's forms.


On Apr 1, 2008, tabasco from Cincinnati (Anderson Twp), OH (Zone 6a) wrote:

'Plum Crazy' is an elegant plummy colored perennial hybrid hibiscus introduced by the Fleming Brothers of Lincoln, Nebraska. The Flemings are famous for having produced several 'rose mallow' hybrids that are are typically crosses of H. moscheutos and H. coccineus varieties, and which are hardy to as far north as Zones 4 and even 3 (with pine bark winter mulches recommended).

We have enjoyed two 'Plum Crazy' hibiscus in a sunny low spot in a front garden for two years and I couldn't do with out them. They are wonderful plants that emerge from dormancy in late spring and don't begin to bloom until July, so they make nice companion plants for spring blooming bulbs, campanulas, and siberian iris. Others recommend planting 'Plum Crazy' with a selection of tall grasses. Whil... read more