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Clematis 'Jackmanii'
jackman clematis
Hybrid of garden origin — raised by George Jackman and Son, Woking, Surrey, England in 1858
Overview
Clematis spp. '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 spp.. 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
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
Container Growing
✓ Suitable for container growing
Minimum container size: 15 gallons