Pruning Pacific bleeding heart

Dicentra formosa does not require traditional pruning in the way shrubs do, but it does benefit from tidying to keep it looking its best and to encourage prolonged flowering. The main task is deadheading spent flower stems throughout the blooming period, which runs from spring through to late summer. Snip off faded flowers at the base of the stem using secateurs or sharp scissors; this prevents the plant from putting energy into seed production and often prompts a second flush of blooms. By late summer or early autumn, the ferny foliage may begin to look tired, yellowing or browning, especially if the soil has dried out during warm weather. You can cut back tatty foliage to ground level at any point once it becomes unsightly, but the formal pruning window is October and November. Use clean, sharp secateurs to remove all top growth down to the crown. This autumn tidy-up prevents fungal problems overwintering on dead leaves and makes way for fresh growth the following spring. If your dicentra has self-seeded and you want to control its spread, remove seedlings or unwanted shoots in autumn or early spring. The rhizomes can spread steadily, so you may also need to lift and divide congested clumps every three to four years in early spring or autumn. This isn't strictly pruning, but it rejuvenates the plant and maintains vigour. Always wear gloves when handling dicentra, as all parts are toxic if ingested and the sap can irritate sensitive skin.