Answer: Regular deadheading or removal of the spent flowers during the growing the growing season helps them bloom over a longer period. Eventually in late summer when the flowering growth becomes very short you may find it helpful to trim them back quite hard. By now, they may be slowing down for the season. You could continue to trim off the spent blooms or you could leave them in place for the birds to enjoy the seeds later in the fall and winter. After frost, if you wish, trim them off short. If you prefer to leave them standing over the winter, be sure to trim them back in the early spring.
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