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Clematis, Early Large-flowered Clematis 'H. F. Young'


Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Clematis (KLEM-uh-tiss) (Info)
Cultivar: H. F. Young
Additional cultivar information:(aka HF Young, Horace Young)
Hybridized by Pennell
Registered or introduced: 1962
» View all varieties of Clematis
View this plant in a garden


Early Large-flowered


8-10 ft. (2.4-3 m)

10-12 ft. (3-3.6 m)


36-48 in. (90-120 cm)

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:

Pale Yellow

Light Blue

Flower Fragrance:

No fragrance

Bloom Shape:



Bloom Diameter:

Large - 5 to 8 inches (12 to 20 cm)

Bloom Time:

Mid Spring

Mid Fall

Late Fall/Early Winter

Sun Exposure:

Full Sun

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 2 - Repeat bloomers; prune immediately after flowering

Patent Information:


Propagation Methods:

From softwood cuttings

From semi-hardwood cuttings

By simple layering

By serpentine layering

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:

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 has been said to grow in the following regions:

Toney, Alabama

Vincent, Alabama

Aurora, Colorado

Loveland, Colorado

Tampa, Florida

Atlanta, Georgia

Chatsworth, Georgia

Cordele, Georgia

Jonesboro, Georgia

Richmond Hill, Georgia

Granite City, Illinois

Mokena, Illinois

Washington, Illinois

Noblesville, Indiana

Council Bluffs, Iowa

Wichita, Kansas

Barbourville, Kentucky

Minden, Louisiana

Monroe, Louisiana

Gardiner, Maine

Parkville, Maryland

Caledonia, Michigan

Hopkins, Minnesota

Hattiesburg, Mississippi

Mesilla Park, New Mexico

Brooklyn, New York

Elmira, New York

Southold, New York

Cary, North Carolina

Elizabeth City, North Carolina

Greensboro, North Carolina

Oxford, North Carolina

Cincinnati, Ohio

Dayton, Ohio

Owasso, Oklahoma

Chiloquin, Oregon

Allentown, Pennsylvania

Butler, Pennsylvania

Eighty Four, Pennsylvania

West Newton, Pennsylvania

Wyoming, Rhode Island

Germantown, Tennessee

Hendersonville, Tennessee

Knoxville, Tennessee

Summertown, Tennessee

Austin, Texas

Gilmer, Texas

Harper, Texas

Lufkin, Texas

Willis, Texas

West Dummerston, Vermont

Chantilly, Virginia

Norfolk, Virginia

Spokane, Washington

Union, Washington

West Bend, Wisconsin

show all

Gardeners' Notes:


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

Blackened crispy leaves are often due to a common fungal disease called clematis wilt. Large-flowered clematis are more prone to clematis wilt than the species and small-flowered hybrids. http://www.missouribotanicalgarden.org/gardens-gardening/you...

Clematis and tomatoes are two exceptions to the usual rule, and are best planted 6 inches deeper than the soil level in the pot. This protects the stem bases from mechanical damage, and helps prevent clematis wilt, whose fungus enters where there's damage. It also helps keep the roots cool.

Many small-flowered hybrids are spectacular in flower, and long-blooming. I consider them indispensable, especially th... read more


On Apr 16, 2015, RrrrrGrrrr from Atlanta, GA (Zone 7b) wrote:

I have four H.F. Young clematis growing on a chain link fence. Three of them really took off and bloomed like crazy this year (third year). The blooms are stunners that start out dark purple and gradually fade to a light blue/purple. The fourth plant has a lot of new growth this spring and will probably catch up with the other three by next year. They are slow to get started, but worth it. Mine get morning sun and afternoon shade. The roots are shaded by some small sasanqua camellias.


On Jan 6, 2014, annakins from Aberdeen, SD wrote:

Have tried this clematis 4 times in 6 years. Even buyng the larger pot size thinking maybe it would do better. Does fine the first year. Each time they have died. Not sure why when there are clematis 1 foot away on either side of them on the fence. Tried different location and the same occurred even with mulching in winter like I do for all my clematis. Going to try a Group 3 clematis of the same color this year instead.


On Jun 17, 2010, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

I currently have 3 varieties of clematis, and this one blooms the best. The flowers are large and the color is really pretty. I'm having trouble keeping this on the trellis because it has gotten so thick and bushy. If I keep up on deadheading this one, it blooms for most of the summer.


On Apr 21, 2009, happyNdirt from Summertown, TN (Zone 7a) wrote:

This is the second year of growth in my garden, and it is already starting to bloom beautifully! The plant is very bushy and healthy, even though I know I don't fertilize as often as I should.


On Apr 20, 2009, 759lady04 from Lufkin, TX wrote:

This Clematis has grown more and more beautiful every year. It is now on it's fourth year in my garden (East Texas zone 8B) and it is stunning. The flowers have held up to a major thunderstorm over the weekend and are unfazed. So, it is tough, beautiful and reliable. The next time I see any more of these for sale I will definately purchase them.


On Sep 11, 2004, henryr10 from Cincinnati, OH (Zone 6b) wrote:

Also known as 'Horace Young'.

Large pale blue flowers
with creamy/yellow stamens (center).
When flowers first open they have a pink bar.
Flowers are single or semi-double.

This plant was awarded the Royal Horticultural Society's Award of Garden Merit in 1993.