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How to Grow Clematis 'Lasurstern'

Clematis 'Lasurstern'

Clematis × jackmanii 'Lasurstern'

vine

Clematis 'Lasurstern' is a vigorous deciduous climbing vine prized for its large, striking deep blue-purple flowers with darker central stamens. This hybrid clematis blooms prolifically from early summer through fall, making it an excellent choice for vertical garden structures. It combines vigor with ornamental appeal and is relatively disease-resistant compared to other clematis varieties.

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Example Clematis 'Lasurstern' timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Clematis 'Lasurstern'

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Clematis 'Lasurstern'

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Clematis 'Lasurstern' dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun to partial shade, minimum 6 hours of direct sunlight daily; afternoon shade beneficial in very hot climates
💧
Water: Keep soil consistently moist but not waterlogged. Water deeply 2-3 times weekly during growing season, more frequently in hot weather. Reduce watering in winter. Mulch to retain soil moisture and keep roots cool.
📏
Spacing: 36 inches
📅
Days to maturity: Blooms begin in first year; peak flowering by second year
🌱
Planting depth: Plant with top of root ball at or slightly below soil surface; bury stem node 1-2 inches deep to encourage basal shoots

Soil

Type: Well-draining loamy soil, rich in organic matter
pH: 6.0-7.0
Amendments:
Compost Aged manure Peat moss Perlite for drainage

Growing Zones

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Thrives in zones 4-9, with best performance in zones 5-8

4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

1

Establishment (Spring Year 1)

4-6 weeks

Young vine with 3-5 leaves developing, tender stem growth beginning

Keep soil consistently moist; provide sturdy support structure; protect from strong winds; pinch back growing tips to encourage branching

2

Vegetative Growth (Late Spring to Early Summer Year 1)

6-8 weeks

Rapid leaf and stem development; climbing tendrils appear and begin clinging to support; plant reaches 3-6 feet

Guide vine onto support; maintain consistent moisture; apply balanced fertilizer monthly; monitor for pests; provide shade cloth if extreme heat occurs

3

First Flowering (Mid-Summer Year 1)

8-12 weeks

Large 5-7 inch diameter flowers with deep blue-purple sepals and prominent dark stamens appear singly and in clusters

Deadhead spent flowers to encourage continuous blooming; continue regular watering and feeding; mulch to keep roots cool

4

Repeat Flowering (Late Summer to Fall Year 1+)

6-10 weeks

Second and sometimes third flush of blooms occurs; flowers may be slightly smaller than first flush; feathery seedheads appear on earlier flowers

Continue deadheading; reduce nitrogen fertilizer to avoid excessive foliage at expense of flowers; maintain water during dry periods

5

Dormancy (Winter)

4-6 months

Plant drops all leaves; stems appear brown and dormant; visible buds on stems indicate next year's growth points

Prune back to 12-18 inches above ground or to first set of healthy buds (Group B clematis pruning); remove dead/weak wood; apply dormant oil spray if pest issues occurred

Companion Planting

Plan your garden →

Plant with:

Roses Lavender Catmint (Nepeta) Russian sage (Perovskia) Delphiniums Ornamental grasses Hydrangea Boxwood

Avoid planting near:

Clematis wilt-susceptible plants in poorly drained areas Plants with shallow, competitive root systems directly at vine base Tall trees that create excessive shade

Common Pests

  • Prune out affected stems 12 inches below wilted area; improve air circulation; avoid overhead watering; ensure good drainage; apply fungicide in severe cases

  • Increase humidity by misting foliage; spray with strong water stream to dislodge; use neem oil or insecticidal soap if infestation is severe

  • Ensure good air circulation; avoid overhead watering; apply sulfur dust or potassium bicarbonate fungicide; remove heavily infected leaves

  • Spray with strong water stream; apply insecticidal soap; use neem oil; encourage natural predators like ladybugs

  • Prune out heavily infested branches; apply horticultural oil spray during dormant season; monitor and remove by hand if minor infestation

Uses

🍳

Ornamental floral displays

Culinary

While not edible, the striking large flowers are prized for fresh flower arrangements and can last over a week in a vase when cut at the proper stage. [source]

🏠

Vertical garden screening and arbor coverage

Household

The vigorous vining growth makes Clematis 'Lasurstern' ideal for covering arbors, pergolas, trellises, and fences while providing stunning seasonal color and structure definition. [source]

🎨

Dried seedhead arrangements

Craft

The feathery, silvery seedheads that form after flowering are attractive in dried arrangements and add interest to late-season and winter garden décor. [source]

🦋

Pollinator support

Wildlife

The prominent stamens and open flower structure attract bees, butterflies, and other pollinators throughout the extended summer and fall bloom season. [source]

Harvest Tips

Cut flowers for fresh arrangements when blooms are fully open; cut stems at 45-degree angle; remove lower leaves and place immediately in water; blooms last 7-10 days in a vase. Deadhead spent flowers throughout growing season to encourage continuous blooming. Allow some flowers to remain on vine in late season to develop ornamental feathery seedheads.

Fun Facts

  • 🌱 Clematis 'Lasurstern' is a Group B or Group 2 clematis, meaning it blooms on both old wood (previous year's growth) and new wood, providing a long blooming season from early summer through fall with careful pruning.
  • 🌱 The name 'Lasurstern' means 'azure star' in German, referring to its distinctive deep blue-purple color and star-like flower form with prominent stamens.
  • 🌱 Unlike many clematis varieties susceptible to clematis wilt disease, 'Lasurstern' is considered relatively resistant when provided with good drainage, air circulation, and proper care.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Deadhead Full Sun Hybrid Mulch Partial Shade Pinch Back
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