Clematis, Herbaceous Clematis, Late, Small Flowered Clematis 'Rooguchi'


Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Clematis (KLEM-uh-tiss) (Info)
Cultivar: Rooguchi
Additional cultivar information:(aka Roguchi, Rougouchi)
Hybridized by Ozawa
Registered or introduced: 1990
Synonym:Clematis integrifolia
» View all varieties of Clematis
View this plant in a garden




6-8 ft. (1.8-2.4 m)


36-48 in. (90-120 cm)


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)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Bloom Color:


Dark Purple/Black

Flower Fragrance:

No fragrance

Bloom Shape:


Bloom Diameter:

Small - less than 2 inches (5 cm)

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer

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

From seed; direct sow outdoors in fall

From seed; stratify if sowing indoors

From seed; sow indoors before last frost

By grafting

By serpentine layering

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

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:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Drought-tolerant; suitable for xeriscaping

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:

Pelham, Alabama

Anchorage, Alaska

Sherwood, Arkansas

San Leandro, California

Sebastopol, California

Chiefland, Florida

Cochran, Georgia

Lawrenceville, Georgia

Marietta, Georgia

Cherry Valley, Illinois

Hanna City, Illinois

Mattoon, Illinois

Milan, Illinois

Michigan City, Indiana

Atalissa, Iowa

Louisville, Kentucky(2 reports)

Taylorsville, Kentucky

Covington, Louisiana

Gardiner, Maine

Swampscott, Massachusetts

Townsend, Massachusetts

Wayzata, Minnesota

Missoula, Montana

Polson, Montana

Salem, New Hampshire

Freehold, New Jersey

Bosque, New Mexico

Mesilla Park, New Mexico

Santa Fe, New Mexico

Southold, New York

Apex, North Carolina

Greensboro, North Carolina

Eugene, Oregon

Sherwood, Oregon

Allentown, Pennsylvania

Lansdowne, Pennsylvania

Philadelphia, Pennsylvania

Pittsburgh, Pennsylvania

Wilkes Barre, Pennsylvania

Clarksville, Tennessee

Hixson, Tennessee

Houston, Texas

Irving, Texas

Lewisville, Texas

Orange, Texas

Round Rock, Texas

South Burlington, Vermont

South Woodstock, Vermont

Fircrest, Washington

South Hill, Washington

Tacoma, Washington

Cedarburg, Wisconsin

Cheyenne, Wyoming

show all

Gardeners' Notes:


On May 4, 2020, BostonPlanted from Boston, MA (Zone 5b) wrote:

I had planted Rooguchi clematis as a kid at my parents house. It was planted in an ill-fated rose garden in a hot dry completely exposed area of the yard. Fifteen years later, only 2 rugosa roses survived in that badly neglected grass-filled garden... and both Rooguchis. I revived the garden and both rooguchis are thriving. Everyone comments on the pretty blue bells. I now plant rooguchi clematis everywhere, letting them sprawl through roses and perennials. The winters here take care of pruning for me. I just cut away the dead vines in early spring.


On Jul 4, 2016, Janice_in_VT from South Woodstock, VT wrote:

This vine is thriving on a stone wall in the rose garden at The Fells, the historic Newbury, NH home of John Hay, secretary to President Lincoln, whose grandson was the naturalist of the same name. This garden, I understand, is not an exact replica of the original garden on the estate. It is beautiful in this setting, alongside a climbing hydrangea petiolaris. I saw it two days ago, July 2, and I hope to grow it myself.


On Jun 4, 2016, judithbeach from Cheyenne, WY wrote:

I have 2 of these vines in Cheyenne Wy. I prune them to the ground in late fall. One is 5 yrs old; the other 4. They are huge and already have flower buds (June 4). I tie them to bamboo stakes & the older is already sprawled all over the ground. I fertilize them with rose fertilizer.


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

This is the most continuously blooming clematis I know, blooming nonstop from early summer till frost.

It gets long and sprawling unless regularly tied back to a trellis. Like C. integrifolia, it can't curl its leaf petioles around a support, and has no means to climb.

Somewhat prone to powdery mildew, less so in partial shade with regular moisture.

This is a cross between C. integrifolia and C. reticulata, bred in Japan for use as a cut flower in the Japanese tea ceremony. It has since become a justifiably popular garden plant.

Hardy to Z3.


On May 22, 2013, sladeofsky from Louisville, KY (Zone 6b) wrote:

I absolutely adore this Clematis. It is a deep purple that looks best with a brighter companion, especially roses. It doesn't climb by tendrils, but it does look for vertical support and will grasp other plants or trellises with its leaf stems. It can grow rather large but is easily managed. It blooms in such profusion. It is truly a must have. From Japan, like so many great Clematis, especially those including American species. It gets it's bell shaped flowers from our native reticulata. Some say C. durandii is in the parentage which would mean there are 3 distinct species in its past, the third being C. lanuginosa which may account for it having slightly larger flowers than either it's C. integrifolia or C. reticulata parents.


On Sep 23, 2012, lbuyer from Michigan City, IN (Zone 6a) wrote:

I've been growing this clematis since spring 2007 and I simply love it. It starts to bloom in the spring and continues right through to early fall. The bells are a lovely color and a welcome change from the big, gaudy, flat-faced hybrids with their seeming delicacy (in actuality, however, they seem tough as nails). I grow numerous other Clematis (Niobe, Jackmanii, Etoile Violette, Ville de Lyon) and, while they come and go, they always have rooguchi for a blooming companion (and its colors blend beautifully with everything).


On Aug 23, 2012, JCG from Anchorage, AK wrote:

Here in Anchorage Alaska my ROOGUCHI is 12 foot tall and is literally covered with blossoms and buds..It overwintered with no problems..Loving it..


On Feb 15, 2010, bfmayer70 from Buffalo, NY wrote:

Our Rooguchi plants thrive in Buffalo, New York, with very little care. Their blossoms are unique, and very colorful, and produce very pretty seedheads. The only problem we have is with powdery mildew - the Rooguchi seems to be particularly susceptable.


On Nov 17, 2009, mwburlin from Philadelphia, PA (Zone 7a) wrote:

Have planted this on an 8 ft arbor covered with wisteria. The rooguchi intertwines with the wisteria and blooms all summer. Doesn't cross the arbor arch portion but is lush to the top on sun drenched east side. bumble bees love the flowers which are profuse. Easy to strip out and prune ( group 3).


On Apr 19, 2008, Taranado from Milan, IL wrote:

I have 3 of these and maybe it depends on where you live, but I prune it back every year. I did not do that the first year and it barely grew. Now it's thriving, and was 6 feet tall last year. I found all of mine on eBay, that's where I discovered it. It really does attract humming birds too. In the summer when this is blooming I have counted 8 to 10 humming birds at one time.


On Jun 1, 2006, doss from Stanford, CA (Zone 9b) wrote:

Clematis Rooguchi is herbacious meaning that it doesn't climb by tendrils. This makes it a great flower for scrambling through perennial gardens. You can still help it climb but it won't choke your plants if you let it wander among low shrubs, roses, or other plants.


On Sep 29, 2004, cceamore from Hixson, TN (Zone 7a) wrote:

I love this clematis because it has the longest bloom period I have ever seen for a clematis.It is a beautiful bell shaped dark purple flower with a royal purple/blue pattern on outside of petal.
The vine itself has black stems with dark green leaves.It likes some sun but seems to burn in direct sun plus the bells lose their pretty shape in full sun and it won't bloom as long.This is an outstanding but rare find. I f you find it then get it .You won't be disapointed.