Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000375
11/12/99

Clematis x jackmanii--Jackman Clematis


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.
'Alabast' - Greenish white flowers.
'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.
'Blue Ravine' - Lilac blue flowers with red anthers.
'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.
'Crimson King' - Crimson , 7-inch flowers.
'Dr. Ruppel' - The large, rose-red flowers have deep
carmine-red bars in the center of each petal.
'Duchess of Albany' - The pink flowers (Vis. 5) 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.
'Edouard Desfosse' - A compact plant with pale blue
flowers.
'Elsa Spath' - Lavender blue flowers with reddish-
purple stamens.
'Ernest Markham' - Red flowers (Vis. 1) with gold
stamens.
'Etoile Violette' - Dark purple star-like flowers that
hold their color. C. texensis.
'Evening Star' - Purple flowers with a red bar.
'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.
'Gravetye Beauty' - C. texensis. Pink flowers.
'Guernsey Cream' - The creamy yellow flowers are
produced on vines that reach a height of 10 feet.
'Gypsy Queen' - Violet purple flowers.
'Halley Hybrid' - Shell pink flowers on compact plants
8 feet tall.
'Henryi' - Pure white flowers produced on both old and
new wood.
'Hilden' - 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 (Vis. 2) 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.
'Ken Dobson' - Dark blue, 7-inch flowers.
'Kermesina' - This cultivar of C. viticella produces
bright red flowers that are about 2 inches across.
'Lady Betty Balfour' - Rich purple flowers.
'Liberation' - Pink flowers with a red stripe.
'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.
macropetala 'White Swan' - White flowers.
'Madame Julia Correvon' - The eight-inch flowers are
dark red.
'Marie Boisselot' - Large, white flowers are produced
on vines about 11 feet tall.
'Masquerade' - Lavender flowers with a mauve stripe on
the petals.
'Mrs. Cholmondeley' - Light lavender flowers produced
freely over a long time period.
'Mrs. N. Thompson' - Dark purple flowers have red stripes
on the petals.
'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 (Vis. 3). 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.
Petite Faucon TM - Dark blue flowers with a yellow
center.
'Pink Champagne' - Purplish-pink flowers, very free
flowering.
'Pink Chiffon' - Pink flowers.
'Pink Fantasy' - Pale pink flowers with a dark pink
stripe.
'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 Velours' - Dark purple flowers, vigorous plants. A
cultivar of C. viticella.
'Royal Velvet' - Dark purple flowers have red anthers.
'Royalty' - Purple flowers have contrasting, yellow
anthers.
'Ruby Glow' - The mauve flowers have a red center.
'Sealand Gem' - Mauve flowers have red stripes.
'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.
'The President' - Dark, bluish purple flowers with
silvery undersides.
'Venosa Violacea' - A cultivar of C. viticella. The
petals are white with purple veins and margins.
'Ville de Lyon' - Velvety carmine red flowers with
lighter centers (Vis. 4).
'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 1999, Weston
Nurseries 1999, Bailey Nurseries 1999, Walters Gardens 1999,
White Flower Farm 1999, Wayside Gardens 1999, Gee Farms
1999, Midwest Groundcovers 1999, Willoway Nurseries 1999.


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