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Q.My potted dahlias have white stuff on leaves

Zone NN16 9NU UK | Anonymous added on September 17, 2020 | Answered

My Dahlias are in very large pots, and at first were beautiful, now after a wet summer the leaves are covered in a white dusty stuff and buds are dying before opening. Help !

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Certified GKH Gardening Expert
Answered on September 19, 2020

This article describes some typical problems that potted dahlias experience: https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/dahlia-pests-and-diseases.htm

From your description, it sounds as though your dahlias have a case of powdery mildew. This article has info on how to deal with that:

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