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plantlaw

Trouble with mint plant

Nick O
6 years ago

Hi -
I have a mint plant that was previously thriving, but in recent weeks a lot of the leaves have been turning brown and dying. It also has had a white powder that almost looks like dust (but isn't) collecting/growing on most of the leaves. I tried washing them off, but it comes back. It also seems to be growing on the side of the pot (see the picture). I had thought powdery mildew potentially (and that I should try neem oil), but was told powdery mildew was unlikely for mint, especially because the air inside isn't particularly moist. I'm in New England, but it sits on a south-facing windowsill and gets plenty of sun as well as being kept fairly warm.
Any thoughts on what it is and what I should do?

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