Pruning Masterwort

Masterwort doesn't require heavy pruning, but a bit of attention at the right times will keep it looking tidy and encourage further flowering. The main pruning windows are March and November, though you'll also want to deadhead during the growing season. After the first flush of flowers fades in early to midsummer, cut back the spent flower stems to just above the basal foliage. This deadheading often prompts a second, lighter flush of blooms in late summer or early autumn. Use clean secateurs or garden shears and remove the entire flowering stem rather than just the faded flower head. If you prefer a more naturalistic look or want to allow self-seeding, leave some stems in place—masterwort seeds itself gently without becoming a nuisance. In November, once flowering has completely finished and the foliage begins to look tatty, cut back all stems to ground level. This autumn tidy-up prevents the old growth from becoming a soggy mess over winter and reduces hiding places for slugs and snails. Alternatively, if you garden in a colder area or want to leave some winter structure, you can delay this cut-back until March. At that point, remove all the previous year's dead foliage just as new growth begins to emerge from the crown. Masterwort doesn't need thinning or shaping—it naturally forms neat clumps. Every three to four years you may want to lift and divide congested clumps in early spring, but this is about rejuvenation rather than pruning.