Hello Gemma and thanks. I usually get some powdery mildew showing up on the leaves this time of year. So far no sign of it but I did have to spray my birdhouse gourd leaves yesterday in my GH. I'm just using a baking soda spray and will use that when or if it appears on the Dahlia leaves. I'm trying to keep good airflow around the plants but they are starting to get very bushy. But another month and a half or less and the frosts will be here.
Hello alp, it's one tsp of baking soda to 500ml of water.
Is the Dahlia that is all leave a young one or divided one? Sometimes that happens, it will bloom next year.
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