I would like to plant some astilbes. What are their site requirements?
Astilbes perform best in moist, well-drained soils in partial shade. Plants like evenly moist soils throughout the growing season. Astilbes do not like dry sites. Their foliage will turn brown when plants don’t have adequate moisture. Water retention in soils that dry quickly can be improved by working organic matter, such as compost or peat, into the soil before planting. After planting, place a 2-inch-layer of mulch around plants to conserve soil moisture. Watering will probably be necessary during prolonged dry periods. Astilbes prefer partially shaded sites that receive 2 to 4 hours of sun per day.