Clematis, Jackman Clematis, Late Large-flowered Clematis 'Jackmanii'


Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Clematis (KLEM-uh-tiss) (Info)
Cultivar: Jackmanii
Hybridized by Jackman
Registered or introduced: circa 1858
Synonym:Clematis x jackmanii
» View all varieties of Clematis


Late Large-flowered


10-12 ft. (3-3.6 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:

Medium Purple

Flower Fragrance:

Unknown - Tell us

Bloom Shape:




Bloom Diameter:

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

Bloom Time:

Mid Summer

Late Summer/Early Fall

Sun Exposure:

Full Sun

Sun to Partial Shade

Light Shade

Partial to Full 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

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

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round in hardiness zone


This plant is said to grow outdoors in the following regions:

Huntsville, Alabama

Scottsboro, Alabama

Bigelow, Arkansas

Brookland, Arkansas

Malvern, Arkansas

Auberry, California

Capistrano Beach, California

Castro Valley, California

Concord, California

Elk Grove, California

Hayward, California

Hesperia, California

Long Beach, California

Los Altos, California

Moreno Valley, California

Palo Alto, California

Redlands, California

San Leandro, California

Aurora, Colorado

Clifton, Colorado

Denver, Colorado

Durango, Colorado

Glade Park, Colorado

Palisade, Colorado

West Haven, Connecticut

Lewes, Delaware

Interlachen, Florida

Lake City, Florida

Alpharetta, Georgia

Braselton, Georgia

Chatsworth, Georgia

Hawkinsville, Georgia

Rincon, Georgia

Tucker, Georgia

Meridian, Idaho

Sandpoint, Idaho

Beecher, Illinois

Chicago, Illinois(3 reports)

Elgin, Illinois

Evanston, Illinois

Hampton, Illinois

Lincoln, Illinois

Mackinaw, Illinois

Marshall, Illinois

Mt Zion, Illinois

Niles, Illinois

Nilwood, Illinois

Oak Lawn, Illinois

Spring Grove, Illinois

Springfield, Illinois

Washington, Illinois

Waukegan, Illinois

Yorkville, Illinois

Bremen, Indiana

Crown Point, Indiana

Fort Wayne, Indiana(2 reports)

Indianapolis, Indiana

Macy, Indiana

Warren, Indiana

Birmingham, Iowa

Lisbon, Iowa

Andover, Kansas

Clay Center, Kansas

Shawnee Mission, Kansas

Barbourville, Kentucky

Ewing, Kentucky

Lexington, Kentucky

Salvisa, Kentucky

Belle Chasse, Louisiana

Zachary, Louisiana

Bethesda, Maryland

Riverdale, Maryland

Silver Spring, Maryland(2 reports)

Amesbury, Massachusetts

Brimfield, Massachusetts

Needham, Massachusetts

West Roxbury, Massachusetts

Westford, Massachusetts

Clarkston, Michigan

Constantine, Michigan

Dearborn, Michigan

Howell, Michigan

Pinconning, Michigan

Plainwell, Michigan

Traverse City, Michigan

Trenton, Michigan

Minneapolis, Minnesota

Red Wing, Minnesota

Saint Paul, Minnesota

Iuka, Mississippi

Natchez, Mississippi

Brunswick, Missouri

Licking, Missouri

Marshall, Missouri

Springfield, Missouri

Sullivan, Missouri

Thayer, Missouri

Chester, Montana

Lothair, Montana

Pahrump, Nevada

Concord, New Hampshire

Egg Harbor Township, New Jersey

Moorestown, New Jersey

Santa Fe, New Mexico

Brooklyn, New York

Buffalo, New York

Glen Head, New York

Sayville, New York

Southold, New York

Watertown, New York

West Valley, New York

Yonkers, New York

Charlotte, North Carolina

Hickory, North Carolina

Marion, North Carolina

Wilmington, North Carolina

Grand Forks, North Dakota

Cleveland, Ohio

Dayton, Ohio

Glouster, Ohio

Hamilton, Ohio

Hudson, Ohio

North Ridgeville, Ohio

Enid, Oklahoma

, Ontario

Chiloquin, Oregon

Lebanon, Oregon

Portland, Oregon

Silverton, Oregon

South Beach, Oregon

Allison Park, Pennsylvania

Chalfont, Pennsylvania

Jessup, Pennsylvania

Lansdowne, Pennsylvania

Mercer, Pennsylvania

Oil City, Pennsylvania

Pittsburgh, Pennsylvania

Wakefield, Rhode Island

Duncan, South Carolina

Laurens, South Carolina

Murrells Inlet, South Carolina

Orangeburg, South Carolina

Summerville, South Carolina

Aberdeen, South Dakota

Nemo, South Dakota

Webster, South Dakota

Bristol, Tennessee

Clarksville, Tennessee

Collierville, Tennessee

Hendersonville, Tennessee

Knoxville, Tennessee

Lafayette, Tennessee

Beaumont, Texas

Dallas, Texas

Gainesville, Texas

Hereford, Texas

Houston, Texas(2 reports)

La Vernia, Texas

Lufkin, Texas

Paris, Texas

Richmond, Texas

Willis, Texas

Salt Lake City, Utah

West Dummerston, Vermont

Leesburg, Virginia

Norfolk, Virginia

Troy, Virginia

Arlington, Washington

Arlington Heights, Washington

Everett, Washington

Kalama, Washington

Oso, Washington

Poulsbo, Washington

Smokey Point, Washington

Soap Lake, Washington

Spokane, Washington

Stanwood, Washington

Vancouver, Washington

Charleston, West Virginia

Brooklyn, Wisconsin

Eau Claire, Wisconsin

Milwaukee, Wisconsin

Random Lake, Wisconsin

Kinnear, Wyoming

Sheridan, Wyoming

show all

Gardeners' Notes:


On Jun 28, 2018, lsjogren from Vancouver, WA wrote:

I have had two of these for a few years and they have grown super well and have put out an abundance of flowers.

There's a red clematis called Ruutel I have planted a couple of, but they have been very slow growers.

I can't be sure whether the Jackmaniis are doing well for me because of their genetics or if the spots in my yard I put them in just happen to be more conducive to good growth, for reasons of soil or light or something.

At any rate, the Jackmaniis are great.


On Jul 29, 2016, landscapergal from Silverton, OR wrote:

I have had 4 of these in different locations. 1 was in Mt. where it was 20 below for a month and didn't phase it at all..Well over 6 ft. and very thick with blooms. Didn't always cut it back in the spring but no matter is still kicked butt.The second place (hostile alkaline clay soil desert but not quite as cold as Mt but close) and it grew OK. Here in Willamette Valley Oregon I planted 2 this year and they are already 4 ft. and bloomed( I'm deadheading today) I can see I will need more supports for one of them. I love this Clematis and would highly recommend it. I have bought them from several places. I do however plant low growing plants around the base of it to keep the roots shaded. The one in MT had Aconite (Monkshood) around it..They bloomed around the same time and the effect was s... read more


On Mar 7, 2016, coriaceous from ROSLINDALE, MA wrote:

One of the first clematis hybrids. Prolific blooms over several months. Due to its C. viticella parent, it's fairly resistant/tolerant of clematis wilt.

Many clematis experts question whether the true 'Jackmannii' is still in cultivation, since most of the plants in commerce as 'Jackmannii' seem to be 'Jackmannii Superba', a similar 19th century cultivar thought by some to be an improvement.

Since it's a hybrid, it will not come true from seed.

All clematis look messy in the winter, but my experience has been that they shouldn't be cut back hard till just before new growth begins in late winter/early spring.

Clematis and tomatoes are two exceptions to the usual rule, and are best planted 6 inches deeper than the soil level in the... read more


On Jul 15, 2015, paula2007 from Silver Spring, MD wrote:

Had some trouble first couple of years because rabbits liked fresh sprouts but after putting a low wire enclosure around it took off. Don't know about recommendation to hard prune since the old wood produces much of the new growth the next year. Now it blooms from spring to fall with abundant deep blue/purple flowers. Looking to propagate these for more blue perennial color in garden. Seeds did not grow next year so trying cuttings next.


On Sep 9, 2014, Bellababy from Bend, OR wrote:

This is my second year with this plant. It receives plenty of sun, but its growth is stumped and it's never flowered. I live in zone 6.


On Jun 10, 2013, AstilbeHere from Toronto,
Canada wrote:

I have a couple of Jackmanii: one crawls up through a daphne and one on a trellis. I have a Hagley Hybrid too, which I really don't look after, yet it puts up its flowers in early June. The best clemmies are the species types. Macropetala (Blue Bird - Bred for the Canadian prairies, so very hardy, in a sunny south facing aspect) and Alpina (Francis Rivis, Rosy O'Grady) varieties come in pink, deep red with white or cream centres. All are reliable, although mostly spring bloomers. The tangutica and the autumn clematis are both great late summer performers, but need a good haircut in early spring. Grow very tall. Just about to try a Betty Corning; seen it do well in Toronto gardens. None of the species varieties seem to get the sudden clematis wilt (some of you talk of wilt and brownin... read more


On Jun 10, 2013, Gardenblue2 from Overland Park, KS (Zone 6a) wrote:

LOVE these!
I have 3 Jackmanii clematis in different parts of my yard.
One is on an obelisk & blooming now. I think it blooms later in the summer too if I cut it back.
One is climbing through my Knock out Roses (by accident, not planned) and is just beautiful! I was so thrilled when I saw this!
One is on a trellis in my side yard.
I cut them all back early in the spring to about 6 inches.
I wholeheartedly recommend this wonderful vining perennial!


On Jun 10, 2013, mensamom from Laurens, SC (Zone 7b) wrote:

The Jackmanii that I planted about 5 years ago had sporadic blooms until this year. I don't prune it unless it starts taking over something it shouldn't. I did add some organic fertilizer to the ground around the plant's base last fall. And this year I have an explosion of purple flowers. Don't know if it was the fertilizer or if this plant is really a "late bloomer" - pun intended!


On Jun 10, 2013, adjalatyke from alliston,
Canada wrote:

Many years ago, I was at a Horticultural club meeting, and the guest speaker [an older gentleman] had known Jackman and it was from that point that I began to pronounce Clematis the same way Jackman you show on your page.


On Jun 9, 2012, Cesarsmom from Concord, NH wrote:

I am so glad I read this page! I never knew clematis needed to be cut back! Mine used to almost cover the chain-link fence where it is planted and bloom its head off, but it has become skimpier each of the last 3 years or so, and this year it is a shadow of its former self; now I know why -- I have never pruned it! I am preparing to move and will certainly want clematis in my new location, but now I know what to do to keep it vigorous. Thank you everyone!


On Apr 23, 2012, GreenThumbToo from Sierra Vista, AZ wrote:

Hello All,
I now live in AZ, but I had a beautiful clematis in IL, growing in my garden of a 1893 house. It was over 10' high, up to 20'. I say this because the house was a large two story, not including the attic and the clematis was almost all the way to the top of the house! It was established when I purchased the home and people would stop by and ask me about this beautiful vine.

All I did was water it, along with my other flowers, in the same bed. It faced east and the feet were shaded by the other plants. I did nothing else to it, including pruning it. It just kept blooming and blooming through spring, summer and fall!

I'm looking for one to plant in my Sierra Vista, AZ garden, hopefully it will grow as nicely as it did in Illinois!


On Apr 17, 2012, outdoorlover from Enid, OK (Zone 7a) wrote:

OMG!!! I can't believe I found the name of this clematis. I bought it around 2006 from Sam's and it did not have a name other than "clematis". It has been growing to beat the band since then. People stop by our house and ask what that plant is. It is awesome. Since we moved I have been sad because I did not bring it with me. Today I started looking at new clematis' to buy and plant and saw this one and it is the same as my old favorite!!!! I'm so excited! Ordered two of them!!! It loves living in our area and blooms its heart out.

I ordered them from Bluestone Perennials and they said this plant immigrated from England in the 1850s.


On Aug 15, 2011, altoclef from Los Altos, CA wrote:

The plant has been in the ground for 5 years. It is growing slowly, and has had one flower, none this year. It gets sun most of the day (6 hours), and the roots are shaded. It is next to a camellia - but gets more sun than the camellia. It is hardly worth the effort - although, apart from staking the plant, I do nothing special.


On Aug 15, 2011, herbella from Albuquerque, NM wrote:

I read that this variety of clematis was supposed to be able to survive in the arid climate of Albuquerque, New Mexico and in our poor, sandy soil. Alas, all three of the plants that I bought died, although I planted them in different areas of our garden. It was an expensive lesson.


On May 31, 2011, bigarden from Beecher, IL wrote:

I love this plant. It is one of the few that I don't have to worry about. It has grown reliably for over 15 years in an enclosed 'planting area' that is filled with dense yellow foundation clay. It loves it. I hard prune to about 12 inches height in January and sprinkle a bit of 'organic' fertilizer about the base. That's it. I would highly recommend this plant to anyone wanting a low maintenance climbing vine. It trains well during its spring growth period.


On May 31, 2011, coffinitup from Pahrump, NV wrote:

Grows beautifully in our intense heat in the desert, just a few miles from Death Valley


On Feb 7, 2010, mamakatz from Orangeburg, SC wrote:



On Nov 22, 2009, bonehead from Cedarhome, WA (Zone 8b) wrote:

I grow this at the foot of a lilac for support, the clematis literally covers the lilac for a second 'bloom' in June-July. I've puzzled more than one person looking at the lilac leaves but seeing clematis blooms. In spring I just cut back hard and pull last year's vines from the lilac before they put on their own show.


On Aug 8, 2009, NDJollyMon from Grand Forks, ND wrote:

Very hardy plant, even with our extreme winters. We have 2 of these vines growing up a large arbor. Giant, long blooming purple flowers on vines about 11' long. Arbor faces Southeast, in full sun with root area mulched. No special winter protection needed. In Spring, I cut back the vine to about 12" from ground and remove old growth. Plant rapidly grows back each year...very reliable. A stunning entrance to the perrenial garden. It gets better each year after patient. It's worth the wait!


On Jul 27, 2009, Marlina from Blaine, MN (Zone 4b) wrote:

My plant gets better each year this has got to be the best one for Minnesota.


On Apr 19, 2009, 759lady04 from Lufkin, TX wrote:

This Clematis has been quite reliable for me. I originally bought it as a piece of root at Lowe's. Now 4-5 years later it is large and vigorous. It vines through the neighboring roses just like I had invisioned. For me, this clematis repeat blooms many times during the season. I really enjoy this plant..


On Sep 14, 2008, gardenlady123 from Plainwell, MI (Zone 5b) wrote:

I thougt my Jackmanii died!!! But was I surprised when it blossomed the best its ever blossomed before. Georgeously. I do not know how many flowers were on the vine this year. (2008) I know now that I have to prune it in the spring time. Will do that next year. Love this clematis.


On Aug 22, 2008, Gabrielle from (Zone 5a) wrote:

Blooms June-August in my garden. Very pretty and prolific.


On Aug 18, 2008, Ladybeetle from zone 7, 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 Sep 21, 2006, mystic from Ewing, KY (Zone 6a) wrote:

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


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

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


On Feb 14, 2006, TBGDN from (Zone 5a) 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 Apr 27, 2005, Gourd from Mesilla Park, NM wrote:

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


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 wasnt 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 Jul 10, 2003, gsanch wrote:

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


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 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.


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.