Jackman Clematis
Clematis jackmanii
A classic climber that covers trellises, walls and fences in large purple flowers in summer, often repeating until frost, and it grows fast enough to screen a patio. Give it sun on top and shade at its roots, with mulch or low plants over them. All parts are toxic, so keep it from children and pets who might chew it.
- Mature size
- 12 × 4.5 ft
- 4 × 1.4 m, tall × wide
- Hardiness
- Zones 4a–9a
- USDA
- Sun
- Full sun to part sun
- Water
- Medium to moist
- Blooms
- Jun–Aug
Jackman Clematis at its mature size
A mature Jackman Clematis grows 10 to 15 feet tall and 3 to 6 feet wide, taller than most people.
Drawn to scale beside a 5 ft 9 in person. With VeraScape, you see it at this size in your own yard.
Typical mature size, unpruned. Sources: NC State Extension.
Through the year
What Jackman Clematis looks like month by month in a typical zone 6–7 garden.
Dormant · Nov–Mar
Thin tangle of bare brown stems on the support.
In leaf · Apr–May, Sep–Oct
Climbing column of dark green leaflets on the support, no flowers.
In flower · Jun–Aug
Covered in large velvety violet-purple flat flowers.
Growing Jackman Clematis
- Grows well in
- The Northeast, the Southeast, the Midwest, the Plains and Mountain West, and the Pacific Northwest.
- Growth rate
- Fast
- Good for
- Climber and fast growing
- Leaves
- Drops its leaves in winter
- Native to
- Garden hybrid
Spacing
VeraScape spaces plants so their grown canopies just touch. For Jackman Clematis, that’s about 4.5 ft apart, center to center.
Place a row in your own yard and VeraScape spaces them at their mature width, so you can see whether they’ll crowd the walk.
See Jackman Clematis in your yard before you dig
Visualize it at its true size, alongside the rest of your design.