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My 30 year old Hydrangea is looking ordinary and has purplish/brown almost like a mould on the leaves.

What is it? And how best can I treat this. Not sure if it is a disease or a pest. Thanks for your valuable advice as usual.

Flowers and Ornamentals • Diseases

Powdery mildew is a very common issue of Hydrangeas


First, give the plant a good prune - remove any dead, disease and damaged branches, as well as any crossing or rubbing branches. Place all infected plant material into the bin to prevent further infection.


To improve pest and disease resistance; and improve plant health, growth and vigour, apply a soil conditioning fertiliser such as Yates Dynamic Lifter Soil Improver and Plant Fertiliser during the dormant and non-flowering stage, and Yates Thrive Natural Roses & Flowers Organic Based Pelletised Plant Food during the flowering season. 



Answered: 16 Apr, 2021

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