Astilbes need constant moisture. Make sure the soil is always slightly moist, especially during dry periods. Fertilize Astilbes in early spring with an organic fertilizer or slow-release fertilizer for flowering plants. This promotes healthy growth and flowering.
Remove wilted flowers to keep the plant looking neat and to encourage flowering. In autumn, you can prune back the foliage to about 10-15 cm above the ground to prepare the plant for winter.
General care tips can be found here
