How to prune centaurea 'amethyst in snow'

Hard cut-back after first flowering (June–July); autumn tidy; spring division as needed. Once the first flower flush finishes, cut stems back to about 10 cm (4 in) above the base or to basal foliage. In autumn, cut all growth to ground level and clear away spent stems.

Mid-season cut-back annually; autumn tidy; divide every 2–3 years. Centaurea 'Amethyst in Snow' responds well to the same regime as its parent, C. montana. After the first early-summer flush, cut all stems back hard to basal foliage to encourage a second flush in late summer. Tidy the plant back to ground level in autumn. Divide every 2–3 years in spring.

Once the first flower flush finishes, cut stems back to about 10 cm (4 in) above the base or to basal foliage. In autumn, cut all growth to ground level and clear away spent stems.