When to Stop Deadheading Roses
Stop deadheading repeat-blooming roses in late summer to early fall, about six weeks before your first frost. Leaving the last spent flowers to form hips signals the plant to harden off for winter.
Through the growing season, deadheading keeps repeat roses blooming by redirecting energy from seed-making back into new flowers. But there is a point to stop: in late summer or early fall, roughly six weeks before your average first frost, leave the spent blooms on the plant.
Allowing those final flowers to form hips tells the rose to stop producing tender new growth and begin hardening off for winter — new shoots pushed out too late are easily killed by frost. As a bonus, the hips add color and feed birds through the cold months. For technique, see our guide to deadheading roses.