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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
Flower Fragrance: No fragrance Slightly Fragrant
Bloom Shape: Single Flat Nodding
Bloom Diameter: Medium - 2 to 5 inches (5 to 12 cm)
Bloom Time: Mid Summer Late Summer/Early Fall
Sun Exposure: Full Sun
Other details: Average Water Needs; Water regularly; do not overwater
Pruning Groups: Group 3 - Summer/Fall bloomers; prune hard in early spring
Propagation Methods: From softwood cuttings From semi-hardwood cuttings From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; sow indoors before last frost
Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds
On Aug 18, 2008, Ladybeetle from Gainesville, TX wrote:
My 'Jackmanii', which was purchased two years ago,started
up growing just fine and it had a total of 3 beautiful blooms! The plant continued to remain healthy but quit growing and quit blooming. I have it facing west so it gets all afternoon sun till about4 or 5pm. The roots are in the shade and the ground is moist. Last year I had just a couple blooms also. I mulch with decomposed horse manure mixed with sawdust.
On May 31, 2008, moma4faith from Huntsville, AL wrote:
In North Alabama, I find Jackmanii to be very hardy and vigorous whether it be in full sun or part shade. Mulch keeps the roots cool while it climbs to the sun. Very easy to grow and it is the perfect specimen to grow out by the pool - lots of sun and gets very hot out there, but Jackmanii can take the heat and provides incredible blooms.
On Nov 26, 2006, JasperDale from Long Beach, CA (Zone 10a) wrote:
For years I thought we couldn't grow Clematis here in So. Calif. Mine is coming up on it's 4th year and is doing great. I have it in a Southern exposure, tops in full sun and roots in shade of a dwf. Abelia , and it grows up into a pink Dream Weaver Rose. It gets better every year. I am now going to try other varieties.
On Jun 28, 2006, nanabest1 from Clarkston, MI (Zone 5b) wrote:
We planted this clematis in our shade garden with dappled morning sun.
It climbs the arbor and produces very large blooms, it's stunning.
nanabest1 in Clarkston, MI
On Feb 14, 2006, TBGDN from Macy, IN (Zone 5b) wrote:
This is the first clematis I ever bought in 1985. It has since been divided at the root mass (a major job: very tough!) in very early spring, and made into several separate plants. I've l lost track of how many 'starts' I have given away to gardening friends. It is unquestionably a favorite of many gardeners. I understand it has been around for a very long time, and with its great growth and blooms not surprising. I am a firm believer in keeping the roots heavily mulched and/or shaded to retain proper moisture and protected from hot sunlight.
On Jun 1, 2005, Gindee77 from Hampton, IL (Zone 5a) wrote:
I've had the same Jackmani Clematis in my garden for over 30 years. It needs to be cut back almost to the ground in early spring and it will grow and bloom for a good share of the summer. It's very hardy in zone 5.
On May 10, 2005, silverbyrch from Portland, OR wrote:
I inherited four clematis plants from my parents last fall and the jackmanii was one of the them. Like other's have noted, they like their toes cool and their heads to be warm. My parent's said it may take a bit for the plant to establish itself and get comfortable in the garden so I really didn't think much of the growth habit per se, I just kept an eye on it and noticed how well it liked the new home.
This year? The goofy thing is having a party of its own! I love it! It's growing beautifully and climbing hardily all over a portion of my backyard cyclone fence. Thankfully it's helping hide the ugly tin shed in my neighbor's back yard. The clematis has not come into bloom yet, but I expect it will within the next couple weeks.
On Sep 10, 2003, jbyrne from St. John's
(Canada) (Zone 5a) wrote:
Had a bit of a problem with it this summer (2003). It is its second year and began to grow vigorously until it suddenly became black and died out; am unsure of the reason. Luckily, a few new shoots followed so the entire plant wasn’t killed.
On Aug 19, 2003, mom2cats from Moorestown, NJ (Zone 7b) wrote:
Once this plant gets established, it's easy to grow and lovely to own. It does need cool "roots" but mulch should not be placed directly around the base of the stem but rather a few inches away. Mildew can be prevented by ensuring good air circulation around the plant.
This plant likes its "head in the sun, and feet in the shade", which is easily accomplished by planting on a south or west wall behind a low growing shrub until the plant has firmly established itself.
On May 23, 2003, DeeSteveH from Gretna, VA (Zone 7a) wrote:
Have had a bit of trouble getting this to bloom until I added sedum and forget-me-nots as ground cover. Apparently the roots need to stay cool in warmer climates. Got some real beauties out there now.
On Oct 10, 2001, Joy from Kalama, WA (Zone 8b) wrote:
Summer flowering.
Locate the Top in full sun, feet in shade to partial shade.
Needs a Fertile, humus rich, well-drained soil.
Prune down to within one foot of soil level before new growth begins (mid-February or first part of March). Can also be pruned in the fall.
Regional...
This plant has been said to grow in the following regions:
, (2 reports) Huntsville, Alabama Iuka, Alabama Scottsboro, Alabama Bigelow, Arkansas Brookland, Arkansas Capistrano Beach, California Elk Grove, California Hayward, California Long Beach, California Moreno Valley, California Redlands, California Aurora, Colorado Clifton, Colorado Denver, Colorado Palisade, Colorado Lake City, Florida Braselton, Georgia Hawkinsville, Georgia Rincon, Georgia Meridian, Idaho Sandpoint, Idaho Chicago, Illinois (2 reports) Hampton, Illinois Mackinaw, Illinois Mt Zion, Illinois Oak Lawn, Illinois Spring Grove, Illinois Washington, Illinois Yorkville, Illinois Bremen, Indiana Fort Wayne, Indiana Indianapolis, Indiana Macy, Indiana Birmingham, Iowa Andover, Kansas Clay Center, Kansas Ewing, Kentucky Lexington, Kentucky Salvisa, Kentucky Zachary, Louisiana Riverdale, Maryland Brimfield, Massachusetts Westford, Massachusetts Clarkston, Michigan Pinconning, Michigan Red Wing, Minnesota Natchez, Mississippi Chester, Montana Lothair, Montana Egg Harbor Township, New Jersey Moorestown, New Jersey Santa Fe, New Mexico Glen Head, New York Southold, New York Watertown, New York West Valley, New York Wilmington, North Carolina Glouster, Ohio Hudson, Ohio North Ridgeville, Ohio Chiloquin, Oregon Portland, Oregon Chalfont, Pennsylvania Mercer, Pennsylvania Pittsburgh, Pennsylvania Murrells Inlet, South Carolina Summerville, South Carolina Nemo, South Dakota Bristol, Tennessee Knoxville, Tennessee Lafayette, Tennessee Beaumont, Texas Dallas, Texas Gainesville, Texas Hereford, Texas Houston, Texas (2 reports) La Vernia, Texas Paris, Texas Richmond, Texas Willis, Texas Salt Lake City, Utah Norfolk, Virginia Troy, Virginia Everett, Washington Kalama, Washington Poulsbo, Washington Soap Lake, Washington Spokane, Washington Charleston, West Virginia Brooklyn, Wisconsin Eau Claire, Wisconsin Milwaukee, Wisconsin Random Lake, Wisconsin Sheridan, Wyoming
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