Astilbe (Astilbe) Every 2 to 3 years as plants become crowded. Spring: Spreading root division. But, that’s exactly what we do when we divide plants and the purpose is both to breathe new life into the plant and to propagate it. Baby’s Breath: Division is difficult; carefully divide in spring or late summer/early fall. Replant outer growth and discard the centers of older plants. Divide every 2 or 3 years in spring: Astilbe: Divide every 3 or 4 years in spring. Use a sharp spade or knife to divide … 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. The PD Ann McCulloh In ideal conditions, Astilbe plants can grow quickly and require more frequent division. Although it may be a bit frightening the first time, it is easy to divide astilbe. Read on to learn how to divide plants. What season to divide Root type Special tips; Astilbe Astilbe spp. 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. Submitted by The Editors on August 1, 2017 - 9:15am. Perennial plants are healthiest and most productive when they are young and have room to spread. 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. Basket-of-gold also can be propagated by stem cuttings in spring or late summer. How wonderful that we can rejuvenate even the oldest residents of a garden by occasionally dividing them. Astilbe Dividing. When dividing perennials, timing and technique are important. Hi Karen, Thanks for writing! Astilbe are relatively slow-growing plants and will bloom for many years before needing to be divided. Divide astilbe plants every four to five years to keep the plants healthy. Keep the plants well-watered after replanting and they will re-establish themselves quickly. Early Spring or fall. Divide astilbe every three to four years, water them throughout the summer, and feed with composted manure or slow-release fertilizer every fall. How Often To Divide Season To Divide: Method Of Division: Asters (Aster) Every year or two to control spread and maintain vigor. The Astilbe plant is a perennial with fern-like foliage and colourful, feathery blossoms. Replant outer growth and discard the centers of older plants Astilbe (Astilbe) Every 2 to 3 years as plants 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. Spreading root division. 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