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Clematis 'Jackmanii'
Jackman Clematis
Hybrid of garden origin — raised by George Jackman and Son, Woking, Surrey, England in 1858
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Overview
Clematis 'Jackmanii' is Jackman clematis, a climbing deciduous vine growing 8-12 feet (2.4-3.7 m) tall and 3-5 feet (90-150 cm) wide. Deep purple to violet-purple large flat flowers 4-6 inches (10-15 cm) with 4-6 velvety tepals from June through September (14 weeks). Climbs by twisting leaf petioles around supports (no tendrils). In Ranunculaceae. Raised by George Jackman and Son in Surrey, England in 1858 — one of the first and most influential large-flowered clematis hybrids, still widely planted 165+ years later. Pruning Group 3 — blooms on new wood only. Hard prune in late winter (February-March) to 6-12 inches (15-30 cm). 'Clematis wilt' is the most common disease — cut affected stems to the ground and new growth typically emerges. 'Cool roots, warm top' — mulch heavily or plant low groundcovers at the base. All parts contain protoanemonin — toxic to pets and humans. Zones 4-9. Part sun to full sun. Growth rate is fast.
Native Range
Hybrid of garden origin — raised by George Jackman and Son in Woking, Surrey, England in 1858. One of the earliest large-flowered clematis hybrids.Suggested Uses
Grown on trellises, arbors, pergolas, fences, and into shrubs or small trees, and in containers of at least 15 gallons (57 L), spaced 3-5 feet (90-150 cm). Long bloom. Hard prune annually. All parts toxic. Zones 4-9.How to Identify
Appearance
Size & Dimensions
Height8' - 12'
Width/Spread3' - 5'
Reaches mature size in approximately 2 years
Bloom Information
Summer to early fall (June-September). Deep purple to violet-purple large flat flowers 4-6 inches (10-15 cm) with 4-6 velvety tepals. 14 weeks. Bee- and butterfly-visited. Fluffy silvery seed heads follow.Detailed Descriptions
Flower Description
Deep purple to violet-purple, large flat open, 4-6 inches (10-15 cm) across, with 4-6 velvety tepals (clematis flowers lack true petals — what look like petals are colored sepals called tepals); June-SeptemberFoliage Description
Medium green, pinnately compound with 3-5 leaflets, each leaflet 2-4 inches (5-10 cm), ovate; climbs by twisting the leaf petioles around supports (clematis do not have tendrils)Growing Conditions
Sun Requirements
Requires 4-8 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Part sun to full sun (4-8 hours). Moist well-drained loam pH 6.0-7.0. 'Cool roots, warm top' — mulch or underplant to shade the root zone. Pruning Group 3 — hard prune in late winter (February-March) to 6-12 inches (15-30 cm). Susceptible to clematis wilt — cut affected stems to the ground. All parts toxic. Zones 4-9.Pruning
Pruning Group 3 — hard prune in late winter (February-March) to 6-12 inches (15-30 cm) above the ground. Blooms on new wood — this annual hard prune is required for vigorous flowering. Provide a climbing support at planting.Pruning Schedule
J
F
M
A
M
J
J
A
S
O
N
D
early spring
Maintenance Level
moderateContainer Growing
✓ Suitable for container growing
Minimum container size: 15 gallons