Species

Clematis x jackmaniiJackman Clematis

30 other cultivars

vine RHS Award

Constance Clematis

Clematis x jackmanii 'Constance'

The Story

Plant Bio

Clematis x jackmanii 'Constance' is a vigorous climber known for its large, rich purple flowers that bloom in mid-summer.

This cultivar is particularly noted for its stunning flower color and the ability to bloom on both old and new wood, making it versatile for gardeners.

Uses & Benefits:

Vigorous flowering climber adds vertical interest and color to gardens.

Provides privacy screens and windbreaks with lush foliage.

Supports pollinators like bees and butterflies with abundant nectar.

SpeciesClematis x jackmaniiJackman Clematis

Essentials

At a Glance

Plant Type

Vine

Height

72 inches

Width

36 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8

Water

Moderate, keep soil evenly moist

Humidity

Prefers moderate humidity

Lifespan

Decades with proper care

Native To

Asia and Europe

Toxicity

Non-toxic

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds in moist soil and keep consistently damp for 2-3 weeks.
Plant bare-root vines in spring after the last frost, 12-24 inches apart.
Support with a trellis or arbor for climbing growth.
Water regularly, especially during dry spells, to keep soil moist.
Prune after flowering to encourage vigorous growth and better blooms.
Mulch around roots to retain moisture and suppress weeds.

Pro Tip

Provide sturdy support early on to guide its climbing habit and prevent damage.

Keep It Thriving

Care Guide

Do

Water deeply during dry periods 💧
Prune in late winter or early spring ✂️
Fertilize with a balanced rose fertilizer in spring 🌱
Support with a trellis or fence for climbing
Mulch to retain moisture and regulate soil temperature

Don't

Avoid overwatering to prevent root rot ❌
Don’t prune after mid-summer as it can reduce flowering ❌
Don’t plant in overly shaded areas, as it prefers sun 🌞
Avoid using harsh chemical pesticides without organic options ❌
Don’t neglect support structures for climbing vines

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Climbing on trellises for vertical accentsCovering fences with lush foliageCreating a fragrant, flowering screen

Companion Plants

Roses Lavender Daylilies Hostas Salvia

Multiply

Propagation Methods

Good to Know

Common Questions

Constance Clematis questions

What zones can Constance Clematis grow in?

Constance Clematis is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Constance Clematis deer resistant?

Yes — Constance Clematis is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Constance Clematis bloom?

Constance Clematis typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Constance Clematis need full sun?

Constance Clematis does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Constance Clematis drought tolerant?

Yes — once established (usually after the first full season), Constance Clematis handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.