The plants will be fine; cut them back now if you cannot stand the look of them, or wait until frost hits them and do the normal cleanup. Do NOT feed late in the season for any reason.
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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.