Astilbe thunbergii thrives in consistently moist soil. Water regularly, especially during dry spells and hot weather, to prevent the soil from drying out.

Aim to keep the soil consistently damp but not waterlogged, as this can lead to root rot.

Cut back faded flower stalks after blooming to maintain tidiness. In late autumn or early spring, remove all dead foliage down to the ground. This helps prevent disease and encourages vigorous new growth.

Astilbe thunbergii can be propagated by division in early spring. Carefully dig up the plant and divide the root ball into smaller sections, ensuring each section has healthy roots and buds.

Replant divisions immediately.

Container-grown Astilbe thunbergii typically benefits from repotting every 2-3 years. This is best done in early spring before new growth begins. Use a slightly larger pot with fresh, well-draining potting mix.