Last year I bought this plant and soon after I got it home, I noticed a white hard crust coating some of the leaves on the interior. I went back to the nursery and was told it’s powdery mildew. It doesn’t actually look like that, at least not like what I have seen on Beebalm.This gets hard, almost like some kind of frost. I have shown it to a number of gardeners and they all seem stumped, and don’t know what to do. It does seem to be a response to leaves being wet, but I water from the bottom, don’t spray it… I have tried a number of mild solutions and I admit, chemicals, but nothing works. Looking online for what others say about this plant, no one seems to have this problem. I assume it’s something that I do- but what? Boy, I would love to have help with this. Another odd thing is that it does not spread to anything else, (which I feared it might). What do you think?
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.