How to Grow Astilbes: Fluffy Blooms for Shady Gardens

Where to Plant Astilbe

Astilbes prefer light to moderate shade, but deep shade will result in few and/or poor flowers; full sun will burn the tender foliage. These plants demand moist, damp soil, but they must also drain well and not puddle, which would ensure their failure. Amend the soil with compost or aged manure (especially in clay types) to increase fertility; astilbe is a heavy feeder. Add perlite and coarse sand to improve drainage.

When to Plant Astilbe

• Astilbe is usually planted as small plants purchased from garden stores in spring or fall.
• Starting from seed is very difficult for the home gardener; astilbe can be difficult to germinate, and resulting plants tend to be short-lived.
• Division is recommended to create new plants at home. Divide existing astilbe plants as soon as you see new growth in early spring.

How to Plant Astilbe

Plant purchased plants about 1 to 3 feet apart, depending on the type. Dig the hole and loosen the soil to about 10 to 12 inches deep. Mix in a handful of compost. Set the crown (where roots and plant connect) just below the soil line. Backfill with the soil removed from the hole. Water well after planting.

If setting bare-root plants, dig holes twice as wide as the plants’ roots and 4 to 6 inches deep. Place the plants so the roots are fanned slightly and pointing downwards, with the crown planted 1 to 2 inches below the ground level. Cover the roots with soil and press firmly.

Water well and keep consistently moist (not soaked).