How to Grow Clematis 'Henryi'
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Clematis 'Henryi'
Clematis × jackmanii 'Henryi'
vineClematis 'Henryi' is a large-flowered clematis cultivar renowned for its stunning pure white, star-shaped blooms with prominent dark stamens. This vigorous deciduous vine produces flowers 6-8 inches in diameter and blooms prolifically from midsummer through early fall. It is an excellent choice for trellises, arbors, and wall-mounted structures in garden landscapes.
When should you plant Clematis 'Henryi' in your zone?
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Example Clematis 'Henryi' timeline · Pittsburgh, PA (Zone 6b)
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Plant Clematis 'Henryi'
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Clematis 'Henryi'
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-9; cold hardy in northern regions with winter protection
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Get my Clematis 'Henryi' timeline →Growth Stages
Vegetative Growth
Spring through early summer (first year or second year for newly planted vines)Vigorous foliage development; vine rapidly extends along support with healthy green leaves, no flowers yet
Train stems to cover support structure, prune lightly to encourage branching, maintain consistent moisture and cool roots, feed monthly
Flowering
June/July through September/October (3-4 months)Large white star-shaped flowers with dark stamens appear along stems; multiple blooms open sequentially over several weeks
Deadhead spent flowers to encourage continuous blooming, maintain consistent water during blooming, reduce nitrogen fertilizer (use bloom-promoting formula), stake and tie sprawling stems
Dormancy
November through MarchVine dies back to ground level or base in late fall; foliage browns and drops; plant becomes bare for winter
Cut back dead stems to 12 inches above ground in late fall or early spring, apply winter mulch in cold zones (3-4 inches), reduce watering in winter
Pruning & Renewal
March through AprilSpring emergence with new shoots from base and lower stems; fresh growth indicates vine readiness for another season
Remove any winter-damaged stems, thin crowded growth, apply balanced fertilizer as new growth appears, gradually increase watering
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Plant deep to protect stems; remove affected stems immediately and destroy; ensure excellent air circulation; avoid wounding stems; apply fungicide if severe; choose resistant cultivars
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Improve air circulation around vine; water at soil level to avoid wetting foliage; remove heavily infected leaves; apply sulfur or neem oil spray; avoid high nitrogen fertilizer
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Spray with strong water stream to dislodge; increase humidity; apply insecticidal soap or neem oil; monitor undersides of leaves
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Remove nearby debris and mulch where they hide; trap in rolled newspaper or aluminum foil; use diatomaceous earth; pick off by hand
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and
Remove hiding spots (dense mulch directly against stems); hand-pick in early morning; copper tape or barriers around base; beer traps; nematodes or iron phosphate bait
Uses
Not edible
CulinaryClematis 'Henryi' is not suitable for consumption. All parts of the plant contain potential irritants and are toxic if ingested. [source]
Cut flowers and floral arrangements
HouseholdThe large, pristine white flowers are highly prized for fresh flower arrangements and have excellent vase life lasting 5-7 days. They create stunning focal points in wedding bouquets and formal displays. [source]
Pollinator and wildlife habitat
WildlifeThe prominent dark stamens attract bees, butterflies, and other pollinators throughout the blooming season. Seed heads provide food and shelter for birds in fall and winter. [source]
Ornamental vine training and living structures
CraftClematis 'Henryi' is ideal for training on arbors, pergolas, trellises, and walls to create stunning living architectural features. Its vigorous growth can cover large structures quickly. [source]
Ornamental seed heads
HouseholdIn late summer and fall, the plant produces feathery, silvery-white seed heads (achenes) that are highly ornamental and persist into winter, providing structure and visual interest even after flowers fade. [source]
Harvest Tips
Not a harvested plant. Deadhead spent flowers to encourage continuous blooming throughout the season. Cut flowers are excellent for arrangements; cut in early morning when stems are turgid. Allow some flowers to remain late in season to develop attractive feathery seed heads for ornamental interest.
Fun Facts
- 🌱 Clematis 'Henryi' was first introduced in 1858 and remains one of the most popular large-flowered clematis cultivars worldwide despite being over 165 years old.
- 🌱 The cultivar name 'Henryi' honors Henry Honywood (sometimes spelled Honeywood), a Victorian gardener and plant breeder, though records of the exact namesake are contested by horticultural historians.
- 🌱 The dark stamens in the center of Clematis 'Henryi' flowers contain the plant's reproductive organs and are highly attractive to insects; there can be 200+ stamens per flower, creating the distinctive dark star center.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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