Description
Astilbe is a genus of herbaceous perennials that are native to Asia and North America. They are commonly grown for their attractive feathery flower spikes that bloom in a range of colours, including white, pink, red, and purple. Here are some horticultural notes on the genus Astilbe:
Soil requirements: Astilbe prefers a rich, moist soil that is well-draining. They do not tolerate dry or waterlogged soil, so it is important to keep the soil consistently moist.
Light requirements: Astilbe prefers partial shade to full shade. They will tolerate some morning sun, but too much sun can scorch the leaves and flowers.
Water requirements: Astilbe needs regular watering, especially during periods of drought. Be sure to water deeply and consistently to keep the soil evenly moist.
Fertilizer requirements: Astilbe benefits from a balanced fertilizer applied in early spring. Avoid over-fertilizing, as this can lead to floppy growth and reduced flower production.
Pruning requirements: Astilbe does not require much pruning, but deadheading spent flower spikes will encourage the plant to produce more flowers. Cut back the entire plant in fall after the foliage has died back.
Propagation: Astilbe can be propagated by division in early spring or fall. Simply dig up the plant, divide the root ball into smaller sections, and replant.
Pests and diseases: Astilbe is relatively pest and disease resistant, but can be susceptible to powdery mildew in humid conditions. Keep the foliage dry and remove any infected leaves to prevent the spread of the disease.