How to prune pinellia ternata

Remove flowers before seeds/bulbils set (early to midsummer); cut back in late summer. Snap or cut flower stems at the base before bulbils mature to limit spread. Once leaves yellow, cut all growth to soil level. In pots, remove any bulbils that drop into the compost.

Ongoing deadheading through summer; one seasonal cutback. Pinellia ternata, used in traditional herbal medicine, needs little pruning as a garden or pot herb. Remove spent flower spathes to prevent prolific self-seeding from aerial bulbils — it can become invasive if allowed to seed freely. Cut foliage back to the ground once it yellows in late summer.

Snap or cut flower stems at the base before bulbils mature to limit spread. Once leaves yellow, cut all growth to soil level. In pots, remove any bulbils that drop into the compost.