I also have some (not bonsai) mini-carnations in my front yard. There are two which have thrived and the rest have struggled. I’m wondering if this is the septoria leaf spot or some kind of wilt? It starts with the leaves turning purple and stunted leaf growth. The flowers on the ones that have struggled are abnormal as well. This variety is “Sunset boulevard”. The healthy ones in the square plot are a different colour variety and seem to be unaffected.
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