Answer: Astilbes are an easy-to-grow perennial, making few demands in the garden. They are quite content when given rich soil in partial to moderate shade. Adequate water is their only real need. If allowed to dry out, flowering is poor and the leaf edges turn brown, and under severe drought, many leaves die completely. Astilbes can grow in full sun but require watering more often. There are no particular diseases with astilbes so I think the problem is cultural. You didn't mention how long the plant has been in your garden - newly planted astilbes can show some stress until the roots become well established. Astilbe foliage will die down if the summer weather is really hot but new leaves and flowers will appear the following spring. Hope this information is helpful!
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