Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000375
01/01/98
Hardiness Zones: 3 to 8 Height: 15 ft Spread: 15 ft Form: spreading Type: deciduous vine Annual Growth Rate: more 18 inches Flowers: Red, white, pink, purple, lavender
Comments: These vines produce large and colorful flowers. The preferred soil is a light loam. Clematis grows best when the plant is in sunlight but the root zone is cool. This may be accomplished by mulching or planting low plants over the clematis' root zone. The vines like regular watering and fertilization. Fertilizing with a liquid fertilizer every 10 to 14 days gives good results. The stems are fragile and easily broken. Most garden varieties bloom on current year's wood so are pruned in the spring. Some bloom on the previous season's wood.
Propagation: Layering is the most suitable propagation technique for the home gardener. Layer in late summer and twist the growth before layering it.
Cultivars: The cultivar descriptions include those that
have C. jackmanii, C. languinosa, C. patens, C. viticella,
C. macropetala or C. florida as parents. No attempt has
been made to separate the cultivars as to parentage.
'Alba Luxurians' - White, bell-shaped flowers have
green-tipped petals.
'Alba Plena' - A cultivar of C. florida. The white
flowers have double, center petals.
alpina - A species producing small blue flowers on vine
that may be 10 feet tall.
alpina 'Willy' - Pale pink flowers with darker pink at
the base of the petals.
'Anna Louise' - Violet flowers have a reddish bar and
red anthers.
'Arctic Queen' - Double, white flowers on plants that
should be pruned back in the spring.
'Asao' - The pink flowers are darker at the edges of
the petals.
'Ascotiensis' - Bright blue, 5 inch flowers are
produced on vines 12 feet tall.
'Barbara Jackman' - Pale blue with deep red bars in the
center of each sepal.
'Bee's Jubilee' - Bluish-pink petals each with a
carmine bar.
'Belle of Woking' - Double blue flowers.
'Betty Corning' - Blue flowers, C. texensis.
'Blue Bird' - A cultivar of C. macropetala that has
light blue, semi double, lantern-like flowers.
'Candida' - Large, white flowers that should be cut
back 2- to 4-feet in early spring. A cultivar of C.
languinosa.
'Carnaby' - The flowers are 5 inches across and are
dark pink with a dark bar.
'Comtesse de Bouchard' - Large, rose pink blooms with
dark stamens. Free flowering.
'Dr. Ruppel' - The large, rose-red flowers have deep
carmine-red bars in the center of each petal.
'Duchess of Albany' - The pink flowers are shaped like
a tulip, C. texensis.
'Duchess of Edinburgh' - Double white flowers, prune
back in the spring.
'Edo Murasaki' - Deep purple flowers with white stamens
having dark tips. Blooms in early summer. Can be
trained as a bush.
'Elsa Spath' - Lavender blue flowers with reddish-
purple stamens.
'Ernest Markham' - Red flowers with gold stamens.
'Etoile Violette' - Dark purple star-like flowers that
hold their color.
'Fireworks' - The blue flowers have a red bar.
'General Sikorski' - Dark purple flowers, suitable as a
cut flower.
'Gillian Blades' Pure white flowers. The petals have
frilled edges.
'Gypsy Queen' - Violet purple flowers.
'Guernsey Cream' - The creamy yellow flowers are
producedon vines that reach a height of 10 feet.
'Hagley Hybrid' - Shell pink flowers on compact plants
8 feet tall.
'Henryi' - Pure white flowers produced on both old and
new wood.
'Huldine' - White flowers, 3 inches across are produced
on plants that can reach a height of 20 feet. Prune
in the spring.
'Jackmanii' - Large, violet-purple flowers. Blooms
until frosted in the fall.
'Jackmanii Alba' - Semi-double, white flowers are
produced plants about 10 feet tall.
'Jackmanii Superba' - The dark violet-blue flowers are
more than 6 inches in diameter.
'John Paul II' - Light pink flowers are produced on old
wood then again in late summer on new wood.
'John Warren' - Grayish carmine with deep red center
veins and edges.
'Kermesina' - This cultivar of C. viticella produces
bright red flowers that are about 2 inches across.
'Lady Betty Balfour' - Rich purple flowers.
'Lilacina Floribunda' - Dark purple flowers.
'Lincoln Star' - Raspberry red flowers edged with
white.
macropetala - This species produces blue, lantern-like
flowers.
macropetala 'Blue Jay' - Light blue flowers.
macropetala 'Markham's Pink' - Mauve colored flowers.
'Madame Julia Correvon' - The eight-inch flowers are
dark red.
'Marie Boisselot' - Large, white flowers are produced
on vines about 11 feet tall.
'Mrs. Cholmondeley' - Light lavender flowers produced
freely over a long time period.
'Mrs. P.B. Truax' - Pale blue flowers have a silvery
stripe in the middle of each petal.
'Mrs. Robert Brydon' - A cultivar of C. X jouiniana
that produces large clusters of white flowers.
'Multi Blue' - Double flowers are dark blue to purple.
'Nelly Moser' - Pale pink flowers with a darker pink
stripe in the center of each flower. Blooms on both
old and new wood
'Niobe' - Deep ruby red flowers with golden stamens
produced in late spring and summer.
'Perle d'Azur' - Nearly blue flowers.
'Pink Champagne' - Purplish-pink flowers, very free
flowering.
'Pink Chiffon' - Pink flowers.
'Polish Spirit' - A cultivar of C. viticella that
produces purplish blue, 3-inch flowers.
'Prince Phillip' - Large, dark purple flowers.
'Purpurea Plena Elegans' - A cultivar of C. viticella.
The double, purple flowers are about 3 inches in
diameter.
'Ramona' - Large, lavender-blue flowers produced on old
and then new wood.
recta - This species produces very fragrant, white
flowers about a half inch in diameter.
'Rouge Cardinal' - Velvety, purplish-red flowers
produced on both old and new wood. Pruning is
suggested after the first flush of growth.
'Royal Velvet' - Dark purple flowers have red anthers.
'Royalty' - Purple flowers have contrasting, yellow
anthers.
'Ruby Glow' - The mauve flowers have a red center.
'Serenata' - Purple flowers with darker bar.
'Sho-Un' - Soft lavender flowers.
'Sieboldi' - A cultivar of C. florida. The white
flowers have double, purple centers.
'Silver Moon' - The large flowers are described as
being silver-mauve.
'Star of India' - Plum colored flowers have a red
stripe.
'Sugar Candy' - The mauve flowers have a dark center
bar on each petal. The yellow anthers have pinkish
gray filaments.
'Sunset' - The dark red flower petals have a purple
margin.
tangutica - This species produces bell-shaped, yellow
flowers about 1 inch across.
'The President' - Dark, bluish purple flowers with
silvery undersides.
'Venosa Violacea' - A cultivar of C. vitacella. The
petals are white with purple veins and margins.
'Ville de Lyon' - Velvety carmine red flowers with
lighter centers.
'Vino' - The red flowers have yellow anthers.
'Violet Star Gazer' - Purple flowers have a white
stripe, the stamens are purple.
'Vyvyan Pennell' - Double, violet blue flowers.
'Warsaw Nike' - Purple flowers are produced on vines 10
feet tall.
'Will Goodwin' - Lavender-blue flowers.
References for Cultivars: Lake County Nursery 1997, Monrovia Nursery Company 1997, Sheridan Nurseries 1997, Weston Nurseries 1997, Bailey Nurseries 1997, Walters Gardens 1997, White Flower Farm 1997, Wayside Gardens 1996.