How to Plant and Grow Astilbe

Astilbe perform best in partial shade, but they will also grow in full shade. In cool, northern climates, most astilbe varieties will tolerate full day sun. Astilbes are hardy perennials and will survive winters in zones 3-8. Astilbes should be planted in spring. Cool, moist soil encourages strong root growth. Loosen the soil 12” deep. Dig a shallow hole and put the astilbe in the hole so the crown of the plant (where the roots meet the stem) sits just below the soil line. Astilbe should be planted in well-drained soil that stays relatively moist throughout the growing season. The plants prefer soil that has a loose texture and is high in organic matter. Adding compost to the planting area will improve the soil and help it retain moisture. After planting, mulch around the plants to reduce moisture loss and help keep the root zone cool. Mulching with organic materials such as compost, shredded bark or shredded leaves will add nutrients and gradually improve the soil’s ability to retain moisture. Newly planted astilbes should be watered weekly for the first growing season. Like all perennials, the plants will need a little time to get established. You can expect them to begin flowering in their second year.