I’d suggest you simply cut them down to the ground and dispose of all the stalks and leaves. The plants will come back, though probably not in time for the garden tour. Perhaps you could slip in a pot of tall annuals or a bamboo tepee to fill the gap temporarily.
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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.