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Powdery Mildew in Clematis

How to identify and treat powdery mildew in Clematis.

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Clematis care requirements

water
Regularly; keep moist, especially when young.
soil
Fertile, moist, well-draining, slightly alkaline.
light
Flowering stems in sun; roots in shade (cool roots warm top).
symptoms

Symptoms to look for in Clematis

White, powdery coating on leaves and stems, often causing distorted new growth and premature leaf drop, especially in late summer.

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Common causes in Clematis

Powdery mildew thrives in the warm days and cool, humid nights typical of late summer, and Clematis planted in spots with poor airflow or dry roots is especially prone.

healing

How to treat powdery mildew in Clematis

Remove heavily affected leaves, improve airflow by thinning growth, and apply a fungicide if the infection is spreading significantly.

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Preventing powdery mildew in Clematis

Keep the root zone consistently moist and mulched (dry roots increase susceptibility), and provide good airflow around the climbing structure.