Jackman's Clematis
Clematis viticella 'Jackmanii'
Essentials
At a Glance
Plant Type
Vine
Height
120 inches
Width
48 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8, 9
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Garden Origin
Toxicity
Toxic if ingested; skin irritant.
The Story
Plant Bio
Clematis 'Jackmanii' is a vigorous, large-flowered, deciduous hybrid climber. It is noted for its profuse, velvety, deep purple flowers from summer to early autumn. One of the most popular clematis cultivars, this Group 3 clematis blooms on new growth. Its iconic 4-6 inch wide, four-sepaled flowers cover the vine, creating a dramatic vertical accent. Requires hard pruning in late winter.
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck young vines into a trellis or support structure.
- Mist cuttings with water to encourage rooting, keep moist for 4-6 weeks.
- Prune in late winter to promote vigorous flowering.
- Fertilize with a balanced fertilizer in early spring and mid-summer.
- Mulch around roots to retain moisture and suppress weeds.
- Water regularly during dry spells, especially in summer.
Pro Tip
Provide sturdy support early on to prevent damage as the vine grows.
Keep It Thriving
Care Guide
Do
- Water deeply once a week during dry periods 🌱
- Prune after flowering to shape and encourage new growth
- Fertilize in spring with a balanced, slow-release fertilizer
- Mulch to conserve moisture and regulate soil temperature
- Provide support for climbing
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t prune in late summer or fall — it can reduce next year’s blooms
- Don’t neglect support structures
- Avoid using high-nitrogen fertilizers that promote leafy growth over flowers
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Fertilize | ||||||||||||
| Mulch | ||||||||||||
| Plant | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Jackman's Clematis questions
What zones can Jackman's Clematis grow in?
Jackman's Clematis is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Jackman's Clematis deer resistant?
Yes — Jackman's Clematis is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Jackman's Clematis bloom?
Jackman's Clematis typically blooms in summer to early fall through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Jackman's Clematis need full sun?
Jackman's Clematis does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
More Clematis to compare
Tie Dye Clematis
Clematis viticella 'Tie Dye'
Dr. Ruppel Clematis
Clematis x jackmanii 'Dr Ruppel'
Yuan Clematis
Clematis viticella 'Yuan'
Burning Love Clematis
Clematis x cartmanii 'Burning Love'
Viva Polonia Clematis
Clematis x hybrida 'Viva Polonia'
Tsukiko Clematis
Clematis x durandii 'Tsukiko'
Keep exploring
Explore the genus
Collections featuring this plant
Grow Jackman's Clematis with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
