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Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info) Genus: Clematis (KLEM-uh-tiss) (Info) Cultivar: Jackmanii Superba Hybridized by Cripps & Son, England; Year of Registration or Introduction: 1878
Hardiness: USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) 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)
Bloom Color: Purple Maroon (Purple-Brown)
Flower Fragrance: No fragrance
Bloom Shape: Single
Bloom Diameter: Medium - 2 to 5 inches (5 to 12 cm)
Bloom Time: Mid Spring Late Spring/Early Summer Mid Summer Late Summer/Early Fall Mid Fall Late Fall/Early Winter
Sun Exposure: Sun to Partial Shade
Other details: Average Water Needs; Water regularly; do not overwater
Danger: All parts of plant are poisonous if ingested Handling plant may cause skin irritation or allergic reaction
Pruning Groups: Group 3 - Summer/Fall bloomers; prune hard in early spring
Patent Information: Non-patented
Propagation Methods: From softwood cuttings From semi-hardwood cuttings
Seed Collecting: N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
On Nov 4, 2009, Joan from Belfield, ND (Zone 4a) wrote:Editor's Note
Some resources list all parts of all Clematis species poisonous if ingested. The toxic principal is Anemonin, and symptoms after ingestion include intense burning sensation in the mouth and mouth ulcers.
Dermatitis and skin irritation has also been recorded, as have allergies and hay fever type symptoms from pollen inhalation.
We tend to err on the side of caution in PlantFiles, and the danger notation in the details above is to caution gardeners, parents and pet owners to look further for more information.
On Aug 15, 2006, northgrass from West Chazy, NY (Zone 4b) wrote:
I love the growing habit of this clematis, never clumps up in masses of tangled stems; it rambles nicely up the porch railing. It also blooms for at least 2 months, maybe more if I would cut out the seed heads. I would love to find a light colored clematis with the same characteristics as this one, so far I have not.
On May 18, 2005, Gindee77 from Hampton, IL (Zone 5a) wrote:
My favorite clematis so far. I've had the same Jackmanii for over 30 years and it's as beautiful as ever. It does best when you cut it back to the ground in my zone in late March or early April.
On Apr 15, 2005, Happenstance from Northern, CA (Zone 10a) wrote:
Limited success in 10a, trying to find a spot for cool roots and still enough sun has been a challenge. Third season and I'm seeing more buds than in the first two seasons.
Regional...
This plant has been said to grow in the following regions:
Salem, Alabama Juneau, Alaska Clayton, California Newark, Delaware Rincon, Georgia Hampton, Illinois Prairieville, Louisiana West Roxbury, Massachusetts Saint Louis, Missouri Edmond, Oklahoma Albany, Oregon Portland, Oregon Allentown, Pennsylvania Aberdeen, South Dakota Murfreesboro, Tennessee Garland, Texas Rockport, Texas Fancy Gap, Virginia Yakima, Washington Onalaska, Wisconsin Owen, Wisconsin
One vendor has this plant for sale.
