How Can I Prevent Black Spots On Purple Dragon Lamium?

Planted for the first time last spring. Flowered beautifully but developed black spots. Stopped flowering and looked awful. Is there such a thing as a pretreatment for this problem? Thank you:)

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1 Comment To "How Can I Prevent Black Spots On Purple Dragon Lamium?"

#1 Comment By GKH_Susan On 01/14/2021 @ 5:46 pm

This link will give you an entire page of articles about leaf spot that should help:
https://www.gardeningknowhow.com/search?q=leaf%20spot ^[1]

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