Keep the soil consistently moist but not waterlogged, especially during the growing season. Astilbe rubra thrives in damp conditions, so regular watering is crucial.

Reduce watering slightly in late fall as the plant enters dormancy, but do not let the soil dry out completely.

After flowering has finished in late summer or early fall, trim back the faded flower stalks to the foliage level. This tidies the plant and can encourage a repeat bloom in some conditions.

In late winter or early spring, remove any dead or damaged foliage.

Astilbe rubra is best propagated by division in early spring before new growth emerges.

Carefully dig up the mature clump and divide it into smaller sections, ensuring each section has healthy roots and at least one growth bud. Replant divisions immediately.

Container-grown Astilbe rubra generally benefits from repotting every 2-3 years in early spring. Choose a pot that is slightly larger than the current one and use a well-draining, humus-rich potting mix.

This helps to refresh the soil and prevent the plant from becoming root-bound.