vine

Sweetheart Clematis

Clematis x cartmanii 'Sweetheart'

The Story

Plant Bio

A compact, evergreen clematis with finely divided, bronze-green foliage and a profusion of small, star-shaped, pure white flowers in spring.

Noted for its delicate, fern-like evergreen foliage and its incredibly profuse spring bloom that covers the entire plant in white flowers. It is ideal for containers and small spaces.

Uses & Benefits:

Ornamental UsesVivid, fragrant flowers enhance vertical gardens and fences.
Practical UsesProvides natural shade and privacy with its dense foliage.
Ecological BenefitsSupports pollinators like bees and hummingbirds.

Essentials

At a Glance

Plant Type

Vine

Height

72 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

7, 8, 9

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

New Zealand (hybrid)

Toxicity

Toxic if ingested, can cause skin irritation.

Bloom period

Early spring – Early summer

J
F
M
A
M
J
J
A
S
O
N
D

In flower about 4 months of the year

Planting

How to Grow

  1. Tuck young vines into a sturdy trellis or fence in early spring.
  2. Mist cuttings with water daily to promote rooting, taking 4-6 weeks.
  3. Prune lightly after flowering to encourage new growth.
  4. Fertilize with a balanced liquid feed every 4-6 weeks during growing season.
  5. Mulch around the base to retain moisture and suppress weeds.
  6. Transplant in early spring or fall when weather is mild.

Pro Tip

Provide a sunny spot with well-draining soil for vigorous flowering and healthy growth.

Keep It Thriving

Care Guide

Do

  • Water regularly to keep soil moist but not waterlogged 🌱
  • Prune after flowering to shape and promote new blooms
  • Use a balanced fertilizer during the active growing season
  • Support with a trellis or arbor for climbing growth

Don't

  • Avoid overwatering, which can lead to root rot ❌
  • Don’t prune in late fall or winter—wait until after flowering
  • Avoid planting in heavy, poorly-drained soil
  • Don’t neglect support structures for climbing vines

Seasonal Care Calendar

TaskJanFebMarAprMayJunJulAugSepOctNovDec
Fertilize
Mulch
Prune
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Climbing vine on arbors and trellisesDecorative garden fence accentShade provider on sunny walls

Companion Plants

Lavender Daylilies Hostas SalviaPeonies

Multiply

Propagation Methods

Good to Know

Common Questions

Sweetheart Clematis questions

What zones can Sweetheart Clematis grow in?

Sweetheart Clematis is hardy in USDA Zones 7–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Sweetheart Clematis deer resistant?

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

When does Sweetheart Clematis bloom?

Sweetheart Clematis typically blooms in early spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Sweetheart Clematis need full sun?

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

Keep exploring

Grow Sweetheart 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.