Pruning Turkish mullein

Verbascum bombyciferum is a short-lived perennial that flowers in early summer and summer, producing tall spikes of yellow blooms. The main pruning task is deadheading spent flower spikes in August and September, once flowering has finished. Cut the main flowering stem back to the basal rosette of silvery leaves at ground level using secateurs or loppers, depending on the thickness of the stem. This prevents the plant from setting seed and exhausting itself, and often encourages the production of smaller side shoots that may flower later in the season or the following year. If you want verbascum to self-seed—and it does so readily in well-drained soil—leave one or two spent spikes intact through autumn. The seeds will scatter naturally, and seedlings will appear the following spring. Be aware that seedlings may not come true to type if other verbascum species are growing nearby, but they usually retain the attractive silvery foliage. In late autumn or early spring, tidy the basal rosette by removing any dead, damaged, or rotting leaves, particularly after wet winters. This helps prevent fungal problems and keeps the plant looking tidy. Verbascum bombyciferum is technically a biennial or short-lived perennial, often flowering in its second year and then declining, so don't be surprised if individual plants are not long-lived. However, self-seeding usually ensures continuity. No other pruning is required; the plant's natural architecture is part of its charm.