Pruning. Extremely little maintenance is required of astilbe plants. The flower heads will dry on the plant and remain attractive for many months. The flowers can be cut whenever they start to look ragged, or left up for winter interest and cut back in the spring.

Should I deadhead my astilbe?

Deadheading astilbe won't encourage new flowers, so you should leave them in place through the fall. Eventually, the flowers will dry on the stalks but should stay in place. ... It makes astilbe winter care a little easier, and all new growth will come back to replace it in the spring.

How do you keep astilbe blooming?

Provide a slow-release fertilizer with a ratio of 3-1-2 in spring, and then feed the plant a high-nitrogen fertilizer when the plant is setting buds in late summer or early autumn. If possible, amend the soil regularly with compost or well-rotted manure.