How to prune thalictrum flavum subsp. glaucum

Deadhead optionally after flowering in midsummer; cut back in late autumn or early spring. Snip spent flower stems to the base after blooming. In early spring, cut all stems to near ground level before new growth emerges. Divide congested clumps every 3–4 years to maintain vigour.

Deadhead optionally in summer; once-annual cutback in autumn or spring. Thalictrum flavum subsp. glaucum (yellow meadow rue) has attractive glaucous foliage and fluffy yellow flowers in midsummer. Remove spent flower stems if you wish to limit self-seeding. Otherwise, leave the plant to stand through winter for structural interest and cut all growth back hard to ground level in early spring.

Snip spent flower stems to the base after blooming. In early spring, cut all stems to near ground level before new growth emerges. Divide congested clumps every 3–4 years to maintain vigour.