There’s no doubt that spent blooms left on a plant can detract from its appearance. But many favorite garden plants “self-clean,” meaning that the flowers naturally shed or shatter their petals when they’re finished blooming. The best “self-cleaners” seem to be shrub roses. Roses with single blossoms tend to self-clean better, for the obvious reason that there are fewer petals to drop. To find other self-cleaning roses, check the American Rose Society’s Handbook for Selecting Roses.
via Roses Made Easy.