Clematis 'Jackmanii'
Clematis × jackmanii
The most popular and reliable clematis variety, beloved for its profuse display of large, velvety purple flowers that bloom from midsummer through fall. This vigorous climber is perfect for covering arbors, fences, or trellises with its stunning 4-6 inch violet-purple blooms that have made it a garden classic for over 150 years.
Sun
Full sun to partial shade
Zones
3–9
USDA hardiness
Difficulty
Moderate
Planting Timeline
Showing dates for Clematis 'Jackmanii' in USDA Zone 7
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Clematis 'Jackmanii' · Zones 3–9
Growing Details
Zone-by-Zone Planting Calendar
Complete Growing Guide
Soil: High Organic Matter. Soil pH: Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Spacing: 12 inches-3 feet, 3 feet-6 feet. Growth rate: Medium. Maintenance: Medium. Propagation: Division, Layering, Stem Cutting. Regions: Coastal, Mountains, Piedmont.
Harvesting
many small, dry fruits each with a silky-plumose tail
Color: Brown/Copper. Type: Achene.
Bloom time: Fall, Spring, Summer
History & Origin
Origin: N. America, Europe, India, Australia, China, Japan, New Zealand
Advantages
- +Disease resistance: Black Walnut, Deer, Rabbits
- +Attracts: Bees, Butterflies, Hummingbirds
- +Wildlife value: Clematis leaves are food for the caterpillars of some Lepidoptera species, including the willow beauty (Peribatodes rhomboidaria). Varieties attract bees, butterflies, hummingbirds, other birds may nest in the vines.
Considerations
- -Toxic (Leaves, Sap/Juice): High severity
- -Causes contact dermatitis
Companion Plants
Plant Together
Lavender
Provides ground cover for clematis roots while both prefer well-drained soil and similar sun exposure
Roses
Classic pairing where clematis can climb through roses, extending bloom season and sharing similar soil preferences
Hostas
Provides essential cool shade for clematis roots while thriving in the partial shade cast by the vine
Catmint
Keeps clematis roots cool and moist while deterring pests like aphids with its aromatic oils
Astilbe
Thrives in the partial shade created by clematis while providing attractive ground cover for root protection
Clematis (other varieties)
Different bloom times extend flowering season and similar growing requirements make them compatible
Honeysuckle
Can intertwine beautifully on same support structure with complementary bloom times and similar care needs
Heuchera
Provides attractive foliage ground cover that keeps clematis roots cool and protected from sun
Keep Apart
Black Walnut
Produces juglone toxin that can severely damage or kill clematis and most other garden plants
Mint
Aggressive spreading nature competes heavily for nutrients and water, potentially overwhelming clematis roots
Bamboo
Extremely invasive root system outcompetes clematis for nutrients and water while potentially damaging structures
Pests & Disease Resistance
Resistance
Moderate resistance to clematis wilt
Common Pests
Aphids, spider mites, earwigs
Diseases
Clematis wilt, powdery mildew, leaf spot