Spacing: 24-36 in. (60-90 cm) 36-48 in. (90-120 cm)
Hardiness: 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: Purple
Bloom Time: Mid Summer Late Summer/Early Fall Blooms repeatedly
Other details: Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral)
Patent Information: Patented
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
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. While the Fleming hibiscus don't like 'wet feet' they do require regular watering, either natural or irrigation.
"Plum Crazy" is a heavy feeder and likes monthly feedings of garden fertilizer until June. From June on, a fertilizer light on the nitrogen is preferred. The Fleming hibiscus are bred to be shorter and more compact ('Plum Crazy' is 4' x 3' according to the Fleming site) than the old fashioned garden hibiscus and may not need pruning unless you choose to. Some gardeners like to pinch out the early tips of perennial hibiscus to promote a bushier plant and more blooms. I have not done this in previous summers, but I may try it this year to create a 'show case' plant.
This hibiscus will stop blooming and die back after the first frosts. I did not cut them back immediatedly in the fall but waited until early spring to cut back to promote plant health and re-emergence in the late spring.
Perennial hibiscus are often easily propagated by cuttings taken from plants in early summer, dosed with a bit of rooting hormone and situated in growing medium or water, however, 'Plum Crazy' is patent protected and propagation is restricted.
I love this particular hibiscus. It is elegantly shaped with beautiful plum tinted leaves and flowers that are proportional to the leaves and stems and other plants in the garden. It is readily available at better perennial nurseries and on the internet. I purchased large plants at an end of season sale for $10 each. Now that I know how lovely they are to have in the garden I would have paid much more!
This plant has been said to grow in the following regions:
San Jose, California Aurora, Colorado Lakeside, Florida Farmersburg, Indiana Galena, Indiana Florence, Mississippi Forked River, New Jersey Baldwinsville, New York Cherry Grove, Ohio Haviland, Ohio Bristol, Pennsylvania Algood, Tennessee Copperas Cove, Texas Jacksonville, Texas Oakhurst, Texas Temple, Texas Manassas, Virginia , Washington Eau Claire, Wisconsin Sauk City, Wisconsin