Clematis, Late Large-flowered Clematis 'Jackmanii Superba'


Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Clematis (KLEM-uh-tiss) (Info)
Cultivar: Jackmanii Superba
Hybridized by Cripps
Registered or introduced: 1880
Synonym:Clematis jackmanii superba
» View all varieties of Clematis


Late Large-flowered


8-10 ft. (2.4-3 m)

10-12 ft. (3-3.6 m)

12-15 ft. (3.6-4.7 m)


4-6 ft. (1.2-1.8 m)


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:


Maroon (Purple-Brown)

Flower Fragrance:

No fragrance

Bloom Shape:


Bloom Diameter:

Medium - 2 to 5 inches (5 to 12 cm)

Bloom Time:

Mid Summer

Late Summer/Early Fall

Mid Fall

Sun Exposure:

Sun to Partial Shade

Other details:

Unknown - Tell us


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:


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

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round


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


Salem, Alabama

Juneau, Alaska

Clayton, California

Denver, Colorado

Newark, Delaware

Rincon, Georgia

Hampton, Illinois

Streamwood, Illinois

Dracut, Massachusetts

West Roxbury, Massachusetts

Trenton, Michigan

Saint Louis, Missouri

Concord, North Carolina

Edmond, Oklahoma

Albany, Oregon

Portland, Oregon

Allentown, Pennsylvania

Columbia, South Carolina

Aberdeen, South Dakota

Murfreesboro, Tennessee

Garland, Texas

Rockport, Texas

Fancy Gap, Virginia

Yakima, Washington

Onalaska, Wisconsin

Owen, Wisconsin

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Gardeners' Notes:


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 California, CA 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.