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Botrytis Blight in Hydrangea

How to identify and treat botrytis blight in Hydrangea.

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Hydrangea care requirements

water
Deeply and regularly. Dislikes drought. Mulch to retain moisture.
soil
Moist, well-draining, humus-rich soil. pH affects colour.
light
Morning sun, afternoon shade. Avoid harsh midday sun.
symptoms

Symptoms to look for in Hydrangea

Fuzzy grey-brown mould on flower heads and leaves, particularly after damp weather, causing affected blooms to brown and collapse.

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Common causes in Hydrangea

Hydrangea's large flower heads and preference for consistently moist conditions create an environment where Botrytis can thrive, especially during cool, damp spells.

healing

How to treat botrytis blight in Hydrangea

Remove and destroy affected blooms and foliage promptly, and improve airflow by thinning dense growth.

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Preventing botrytis blight in Hydrangea

Avoid overhead watering, especially during flowering, and prune to maintain good airflow through the shrub.