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Clematis Jackmanii

Clematis × jackmanii

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Jackman clematis is a popular large-flowered hybrid deciduous vine producing abundant deep purple flowers (4–6 inches across) from mid-summer to early fall. It grows vigorously to 10–15 feet and is one of the most reliable and beginner-friendly large-flowered clematis varieties due to its robust constitution and resistance to wilt disease. The showy blooms make it a garden favorite for arbors, fences, and walls.

Clematis Jackmanii

Common Problems

Select the problem your Clematis Jackmanii is experiencing to get a treatment guide.

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Yellow Leaveschevron_right
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Slow Growthchevron_right
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Powdery Mildewchevron_right
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Brown Spotschevron_right
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Underwateringchevron_right
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Wiltingchevron_right

Care Guide

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Light
Full sun (6+ hours daily) is essential for abundant flowering and vigor. Partial shade reduces flower production.
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Water
Water regularly to keep soil consistently moist but well-drained. Jackman clematis appreciates steady moisture during active growth; reduce watering in winter dormancy.
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Soil
Well-draining, fertile soil enriched with organic matter, pH 6.0–7.5. Mulch the base to keep roots cool and soil evenly moist.
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Fertiliser
Apply balanced fertilizer in early spring and again in early summer. Avoid high-nitrogen formulas that promote foliage at the expense of flowers.
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Temperature
Hardy perennial; thrives in cool to warm temperate climates. Cold-hardy down to USDA zone 5.
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Humidity
Moderate humidity with good air circulation is ideal. Avoid wet, stagnant conditions that promote fungal disease.

Toxicity

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Clematis jackmanii is non-toxic. Minor skin sensitivity may occur with prolonged sap contact in sensitive individuals.

Common Diseases

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Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.