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Jackman's Clematis Clematis x jackmanii

Phonetic Spelling
KLEM-ah-tiss jak-MAN-ee-eye
This plant has high severity poison characteristics.
See below
Description

Jackman’s clematis is a woody, deciduous, perennial, twining climber in the buttercup family (Ranunculaceae). It is a hybrid of Clematis languinosa and Clematis viticella, introduced by English horticulturalist George Jackman in 1858. Many cultivars have been selected from this cross.

Jackman’s clematis requires full sun to partial shade and clay, loam, or sandy, moist soil with good drainage and a neutral pH. Clematis prefer to have their roots shaded so mulch or over plant with other perennials. Prune in late winter or early spring before new growth emerges. 

This plant presents a long period of interest. First, large, showy, abundant flowers bloom in summer and sporadically until frost. The bloom yields a coppery brown, plumose seed head that resembles a sea anemone.  

Use Jackman’s Clematis where it can grow vertically such as on a rock wall, a patio trellis, or trees and shrubs in a woodland area. Because it can rapidly reach 10 to15 feet high and 3 to 6 feet wide, it is often chosen for areas where screening or privacy are needed. It provides beautiful flowers and is an excellent choice for an English garden or a cottage garden. It is resistant to deer and rabbit foraging and tolerates growing under black walnut.

Insects, Diseases and Other Plant Problems: No significant problems. 

VIDEO Created by Elisabeth Meyer for "Annuals, Perennials, Vines, and Groundcovers" a plant identification course offered in partnership with Longwood Gardens. 

 

 

 

Profile Video:
See this plant in the following landscape:
Cultivars / Varieties:
  • 'Blekitny Aniol' aka 'Blue Angel'
    Lavender-blue flowers with lighter central bar, yellow stamens
  • 'Comtesse de Bouchaud'
    Pink flowers produced in large quantities
  • 'Dominika'
    Ruffled deep mauve flower conspicuously veined over a two-tone light and dark mauve base
  • 'Jackmanii Alba'
    Large white flowers with slight pink/blue tinge
'Blekitny Aniol' aka 'Blue Angel', 'Comtesse de Bouchaud', 'Dominika', 'Jackmanii Alba'
Tags:
#purple#showy flowers#deciduous#poisonous#full sun tolerant#easy to grow#climbing#seedheads#cottage garden#rabbit resistant#moist soil#fast growing#privacy#well-drained soil#trellises#summer flowers#deer resistant#vigorous vine#victorian garden#exotic looking#fantz#vertical spaces#garden walls#arbor#partial shade tolerant#problem for cats#problem for dogs#problem for horses#woodland garden#repeat flowering#container plant#fence#cpp
 
Cultivars / Varieties:
  • 'Blekitny Aniol' aka 'Blue Angel'
    Lavender-blue flowers with lighter central bar, yellow stamens
  • 'Comtesse de Bouchaud'
    Pink flowers produced in large quantities
  • 'Dominika'
    Ruffled deep mauve flower conspicuously veined over a two-tone light and dark mauve base
  • 'Jackmanii Alba'
    Large white flowers with slight pink/blue tinge
'Blekitny Aniol' aka 'Blue Angel', 'Comtesse de Bouchaud', 'Dominika', 'Jackmanii Alba'
Tags:
#purple#showy flowers#deciduous#poisonous#full sun tolerant#easy to grow#climbing#seedheads#cottage garden#rabbit resistant#moist soil#fast growing#privacy#well-drained soil#trellises#summer flowers#deer resistant#vigorous vine#victorian garden#exotic looking#fantz#vertical spaces#garden walls#arbor#partial shade tolerant#problem for cats#problem for dogs#problem for horses#woodland garden#repeat flowering#container plant#fence#cpp
  • Attributes:
    Genus:
    Clematis
    Family:
    Ranunculaceae
    Life Cycle:
    Perennial
    Woody
    Recommended Propagation Strategy:
    Stem Cutting
    Country Or Region Of Origin:
    English hybrid
    Climbing Method:
    Twining
    Dimensions:
    Height: 10 ft. 0 in. - 15 ft. 0 in.
    Width: 3 ft. 0 in. - 6 ft. 0 in.
  • Whole Plant Traits:
    Plant Type:
    Perennial
    Poisonous
    Vine
    Woody Plant Leaf Characteristics:
    Deciduous
    Habit/Form:
    Climbing
    Growth Rate:
    Rapid
    Maintenance:
    Medium
    Texture:
    Coarse
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Partial Shade (Direct sunlight only part of the day, 2-6 hours)
    Soil Texture:
    Clay
    Loam (Silt)
    Sand
    Soil pH:
    Neutral (6.0-8.0)
    Soil Drainage:
    Good Drainage
    Moist
    Available Space To Plant:
    3 feet-6 feet
    NC Region:
    Coastal
    Mountains
    Piedmont
    USDA Plant Hardiness Zone:
    4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
  • Fruit:
    Fruit Color:
    Brown/Copper
    Fruit Value To Gardener:
    Showy
    Display/Harvest Time:
    Fall
    Fruit Type:
    Achene
    Fruit Description:
    In clusters, each fruit an achene, with long, persistent, plumed style at maturity.
  • Flowers:
    Flower Color:
    Blue
    Pink
    Purple/Lavender
    Red/Burgundy
    Flower Inflorescence:
    Cyme
    Flower Value To Gardener:
    Good Cut
    Long Bloom Season
    Showy
    Flower Bloom Time:
    Summer
    Flower Shape:
    Star
    Flower Petals:
    4-5 petals/rays
    6 petals/rays
    Colored Sepals
    Flower Size:
    3-6 inches
    Flower Description:
    Abundant 5-7" in diameter, open, four-sepaled (occasionally 5 or 6), violet-purple flowers
  • Leaves:
    Woody Plant Leaf Characteristics:
    Deciduous
    Leaf Color:
    Green
    Leaf Type:
    Compound (Pinnately , Bipinnately, Palmately)
    Leaf Arrangement:
    Opposite
    Leaf Shape:
    Cordate
    Obovate
    Ovate
    Leaf Margin:
    Entire
    Hairs Present:
    No
    Leaf Length:
    1-3 inches
    Leaf Width:
    1-3 inches
    Leaf Description:
    Opposite, pinnately compound, 2-4.5 inches long, upper leaves often reduced to terminal leaflet and appear simple; leaflets commonly 3, ovate, acute, cordate, entire, glabrous and deep green above, usually paler and pubescent beneath, to 4.5 inches.
  • Stem:
    Stem Color:
    Brown/Copper
    Red/Burgundy
    Stem Is Aromatic:
    No
    Stem Description:
    Slender, light reddish-brown or grey-brown, with 6 prominent ridges; pith star-shaped or angular, white, continuous.
  • Landscape:
    Landscape Location:
    Container
    Patio
    Rock Wall
    Vertical Spaces
    Woodland
    Landscape Theme:
    Children's Garden
    Cottage Garden
    English Garden
    Design Feature:
    Screen/Privacy
    Attracts:
    Bees
    Butterflies
    Hummingbirds
    Resistance To Challenges:
    Black Walnut
    Deer
    Rabbits
    Problems:
    Poisonous to Humans
    Problem for Cats
    Problem for Children
    Problem for Dogs
    Problem for Horses
  • Poisonous to Humans:
    Poison Severity:
    High
    Poison Symptoms:
    CAUSES SEVERE PAIN IN THE MOUTH IF EATEN! SKIN IRRITATION MINOR OR LASTING ONLY FOR A FEW MINUTES.Burning sensation of mouth and mouth ulcers; skin redness and burning sensation, salivation, vomiting, diarrhea. Dermatitis, ingestion, inhalation
    Poison Toxic Principle:
    protoanemonin
    Causes Contact Dermatitis:
    Yes
    Poison Part:
    Flowers
    Fruits
    Leaves
    Roots
    Sap/Juice
    Seeds
    Stems