It sounds like what’s on your holly bush. Some of it seems like the begonia pic. It is in an airy space, and I’ve cut off most of the branches on the bottom hoping that if they don’t get wet it will disappear, but it doesn’t. Very crusty and hard on the interior leaves, more powdery on the outer, and you can’t rub it off.
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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.