Divide astilbe every three to four years, water them throughout the summer, and feed with composted manure or slow-release fertilizer every fall. The Astilbe plant is a perennial with fern-like foliage and colourful, feathery blossoms. When dividing perennials, timing and technique are important. If a plant must be moved or has outgrown its space, or if you want to make more plants from the original mother plant, do so in early spring or late fall. Baby’s Breath: Division is difficult; carefully divide in spring or late summer/early fall. How wonderful that we can rejuvenate even the oldest residents of a garden by occasionally dividing them. Wait until after the current blooms have died, dividing them on a cool early fall day. Basket-of-Gold: Divide in late summer/early fall. Although it may be a bit frightening the first time, it is easy to divide astilbe. In ideal conditions, Astilbe plants can grow quickly and require more frequent division. Submitted by The Editors on August 1, 2017 - 9:15am. Early Spring or fall. Spreading root division. Astilbe Dividing. When you dig up the plants leave as much room from the base of the plant as possible so as to cause as little damage to the roots as possible. Keep the plants well-watered after replanting and they will re-establish themselves quickly. Perennial plants are healthiest and most productive when they are young and have room to spread. Replant outer growth and discard the centers of older plants. Addition of compost will also increase the content of essential organic matte… Dividing astilbe plants are good for the plants because it eliminates the formation of overcrowded clumps, and helps the plants stay heathy. The PD Ann McCulloh Divide astilbe plants every four to five years to keep the plants healthy. Read on to learn how to divide plants. When and How to Divide Some Common Perennials Common Name (Botanical Name) How Often to Divide Season to Divide Method of Division Asters (Aster) Every year or two to control spread and maintain vigor Spring Spreading root division. Use a sharp spade or knife to divide … Hi Karen, Thanks for writing! Spring: Spreading root division. The best time to divide astilbe is either in the spring or the fall, when temperatures are cool and excessive heat won’t place unnecessary stress on divisions while they’re still getting established. What season to divide Root type Special tips; Astilbe Astilbe spp. Divide every 2 or 3 years in spring: Astilbe: Divide every 3 or 4 years in spring. Basket-of-gold also can be propagated by stem cuttings in spring or late summer. Astilbe are relatively slow-growing plants and will bloom for many years before needing to be divided. There are a few good tips to keep in mind when dividing your astilbe to make sure next year’s stalks are strong. 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