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. Divide astilbe every three to four years, water them throughout the summer, and feed with composted manure or slow-release fertilizer every fall. Perennial plants are healthiest and most productive when they are young and have room to spread. Early Spring or fall. Basket-of-Gold: Divide in late summer/early fall. 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. 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. 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. Hi Karen, Thanks for writing! Divide astilbe plants every four to five years to keep the plants healthy. When dividing perennials, timing and technique are important. Astilbe (Astilbe) Every 2 to 3 years as plants become crowded. Wait until after the current blooms have died, dividing them on a cool early fall day. The PD Ann McCulloh Replant outer growth and discard the centers of older plants. Although it may be a bit frightening the first time, it is easy to divide astilbe. Read on to learn how to divide plants. Keep the plants well-watered after replanting and they will re-establish themselves quickly. Spreading root division. The Astilbe plant is a perennial with fern-like foliage and colourful, feathery blossoms. Use a sharp spade or knife to divide … 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. 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. Replant outer growth and discard the centers of older plants Astilbe (Astilbe) Every 2 to 3 years as plants Divide every 2 or 3 years in spring: Astilbe: Divide every 3 or 4 years in spring. How Often To Divide Season To Divide: Method Of Division: Asters (Aster) Every year or two to control spread and maintain vigor. Astilbe are relatively slow-growing plants and will bloom for many years before needing to be divided. Submitted by The Editors on August 1, 2017 - 9:15am. How wonderful that we can rejuvenate even the oldest residents of a garden by occasionally dividing them. 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