Every 3 to 4 years plants like this need dividing to grow better. Wait until the temperature cools and it’s at least 6 to 8 weeks before the ground freezes. Discard any divisions that show signs of rot or lack of vigor. Cooler temperatures are best for dividing astilbe, so plan your divisions for the spring. This doesn’t mean that they are completely pest free, however. Some perennials like Astilbe and Phlox can develop extremely woody roots that may require a saw, small ax or Sawzall to penetrate. How to Divide 45 Favorite Perennials: Not sure how or when to divide your perennials? The central crown can also be discarded. Late summer and early fall is the time to plant, divide, and transplant many different perennials, shrubs, and trees including spring flowering perennials. 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. To lift a perennial with minimal root damage, begin digging at its drip line. Divide the phlox sooner if the plant becomes over-crowded, or if the center of the plant fails to bloom and produces less foliage. Use a sharp spade, garden fork or garden knife to carefully divide … Are you saying that I should have waited to transplant until the Spring? You may also divide the astilbe in the fall as long as the temperatures are cool. 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. Astilbe, like many perennials, can be divided if the root clump gets too large. I very... My wife ordered a glass screen to use as a room divider. Amend the soil in advance, as required. 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. The rule of thumb for deciding which perennials to transplant or divide is based on bloom time. This is how it is done. Once you have determined when to divide your daffodils. Or, was it because this person wanted to divide and transplant, rather I removed the entire plant and transplanted? Many of the plants commonly used in commercial property landscaping are great candidates for dividing and transplanting in the fall: hosta, black-eyed Susan, daylily, yarrow, purple coneflower, astilbe. You don?t need to transplant or divide astilbe plants every year, but every two to four years. Mulch the planting spot with a couple of inches of bark dust, wood chips, of leaf mold. Mix thoroughly and let the soil settle for a few weeks. to this site, and use it for non-commercial use subject to our terms of use. In wet autumns, delay until spring. In very cold regions, it's best to divide and transplant no later than early fall so the plants have time to get established before the cold weather and snow hits. Astilbe Growing Tips and Benefits. Herbaceous. 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. Watering the plants you want to divide a few days before you … You can transplant/divide in early spring though fall is fine, too. Crocosmia and Dierama. Choosing Shovels For Gardens: What Shovel Do You Need For Gardening, How To Grow Astilbes: Planting And Caring For Astilbe Plants, Astilbe Propagation Methods – How To Propagate Astilbe Plants, Silver Torch Cactus Facts – Learn About Silver Torch Cactus Plants, Are Succulents And Cacti The Same: Learn About Cactus And Succulent Differences, What Is An Old Lady Cactus – How To Grow An Old Lady Cactus Flower, Marjoram Blossoms: Can You Use Marjoram Flowers, Caring For Amaryllis Grown In Water: Learn About Growing Amaryllis In Water, Picking Kumquats – Tips On Harvesting A Kumquat Tree, Chestnut Tree Propagation: Growing Chestnut Trees From Cuttings, Plants Lost To Deer: Living With Deer Damage, Epic Garden Failure – Watering Plants And Killing Plants, Cactus Houseplants: My Journey Learning To Grow Cacti.