Cold-Damaged Potted Aster: Prune and Wait for Regrowth

A Washington State (Zone 7) gardener's blue aster from Home Depot wilted and leaves turned blackish after a cold night. Asked if cutting back will help it regrow.

Action

Tom advised checking the tag for Zone 7 hardiness. Blackish leaves suggest frost damage or shock from indoor-to-outdoor transition without hardening off. Prune damaged parts; it should regrow. Keep hydrated but not soggy, feed with 12-12-12 balanced fertilizer.

Prune frost-damaged growth; harden off greenhouse plants before outdoor exposure.