You deadhead yarrow plants by cutting off the faded flower
blossom.
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Deadhead Miles - 1973 is rated/received certificates of:
USA:R
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No.
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You should deadhead your peonies back after the bloom has gone
by. Deadhead back to the leaf of that stem. Let the green stems and
leaves die back naturally. We cut ours back to the ground in the
fall.
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It is better to deadhead all annuals as when they set seed they
stop flowering.