How to prune tall goldenrod

Deadhead immediately after flowering in autumn; cut back fully in late winter. Remove spent flower heads before seeds mature to curb self-seeding. Cut all stems to ground level in late winter. In late spring, cut stem tips back by one-third to produce a shorter, more compact plant if desired.

Annually (deadheading + late-winter cutback); divide every 2-3 years to control spread. Tall Goldenrod spreads aggressively by rhizome and can self-seed prolifically. Deadhead promptly after flowering to limit spread, and cut stems back to ground level in late winter. Division every few years keeps colonies in check. A late-spring Chelsea chop can also reduce the plant's ultimate height in formal settings.

Remove spent flower heads before seeds mature to curb self-seeding. Cut all stems to ground level in late winter. In late spring, cut stem tips back by one-third to produce a shorter, more compact plant if desired.