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PlantFiles: Late, Large-Flowered Clematis, Jackman Clematis
Clematis 'Jackmanii'

 
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Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Clematis (KLEM-uh-tiss) (Info)
Cultivar: Jackmanii

Synonym:Clematis x jackmanii

7 vendors have this plant for sale.

21 members have or want this plant for trade.

Group:
Late Large-flowered

Height:
10-12 ft. (3-3.6 m)

Spacing:
4-6 ft. (1.2-1.8 m)

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

By TomC_UK
Thumbnail #1 of Clematis  by TomC_UK

By hczone6
Thumbnail #2 of Clematis  by hczone6

By MossRose
Thumbnail #3 of Clematis  by MossRose

By Joy
Thumbnail #4 of Clematis  by Joy

By hczone6
Thumbnail #5 of Clematis  by hczone6

By greygirl
Thumbnail #6 of Clematis  by greygirl

By hczone6
Thumbnail #7 of Clematis  by hczone6

There are a total of 27 photos.
Click here to view them all!

Profile:

11 positives
6 neutrals
No negatives

Gardeners' Notes:

RatingAuthorComment
Positive Gabrielle On Aug 22, 2008, Gabrielle from Washington, IL
(Zone 5a) wrote:

Blooms mid June to early July. Very pretty and prolific.

Neutral Ladybeetle 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.

Positive moma4faith 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.

Positive JasperDale 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.

Neutral mystic On Sep 21, 2006, mystic from Ewing, KY
(Zone 6a) wrote:

Received The Royal Horticultural Society, Award of Garden Merit (AGM) in 1993.

Positive nanabest1 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

Positive sm_all1 On May 19, 2006, sm_all1 from Virginia Beach, VA wrote:

1ST year sleeps, 2nd year creeps, 3rd year leaps. Great plant.

Positive TBGDN 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.

Positive Gindee77 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.

Positive silverbyrch 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.

Positive Gourd On Apr 27, 2005, Gourd from Antoine Mesilla Park/Mesquite, NM
(Zone 7b) wrote:

Very prolific and 2nd year blooms better than the first.

Neutral jbyrne 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.

Positive mom2cats 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.

Neutral gsanch On Jul 10, 2003, gsanch wrote:

I am having a lot of problems with powdery mildew. I have it in some shade...possibly too much?

Positive DeeSteveH 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.

Neutral Terry On Mar 26, 2002, Terry from Murfreesboro, TN
(Zone 7a) wrote:

Clematis jackmanii is a hybrid species introduced in 1862, and is arguably the most popular Clematis in cultivation.

Neutral Joy 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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