Dividing your astilbe should be done in late summer or early autumn. Amend the new planting location two weeks prior to planting. The plants grow to 2 feet tall and bloom from mid to late summer. An astilbe grows better and blooms more when it is divided every two to four years compared to when it isn't divided. Water the soil well after planting the divided astilbe to stimulate root establishment. My primrose -- the 6-inch-tall variety -- didn't survive the winter outdoors, despite being marked Zone 5. Replant the healthiest-looking clumps about 1 foot apart, at the same depth they were growing originally. Gently separate the clumps of root that have formed around the main root crown. Astilbe comes in white and red, as well as pink. Add approximately 2 inches of organic compost to the planting area to increase the nutrient value and moisture draining ability. Spring, Fall: Clump: Divide in early spring or after it stops … Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/21). By dividing the plant when it is not flowering, all the plant’s energy can go to root and leaf growth. Astilbe will spread quickly, forming broad clumps. Plants can be divided successfully at almost any time if they are kept well-watered afterwards. Perennial astilbe plants crave phosphorus, and they benefit from spring and fall fertilizer … Adult plants perform better if divided every three to four years. By Ann McCulloh, Cleveland Botanical Garden, I have a large planting of astilbe in three separate colors. They should be divided every three or four years, in early spring, to maintain maximum vigor and growth. Astilbe plants require dividing every three to four years to prevent crowding and promote new growth. © 2021 Advance Local Media LLC. Note to readers: if you purchase something through one of our affiliate links we may earn a commission. This generally is done every four or five years. What I was sold has small blossoms and no odor. https://gardenerspath.com/how-to/propagation/astilbe-division Copyright Leaf Group Ltd. // Leaf Group Lifestyle. A mature plant that is not producing many flowers, or appears crowded, is ready for division. She previously worked as a technical writer for a software development company, creating software documentation, help documents and training curriculum. Regardless of which method is used, dividing the plant when it is not in bloom allows all the plant's energy to go to root and leaf growth. Please support high-quality local journalism. Indoor Astilbe: All rights reserved (About Us). Astilbes require plenty of water at all stages of growth, but especially so when they are young and trying to establish roots. One of the first Astilbes to flower, Astilbe 'Europa' (Astilbe japonica) features luminous, dense, pyramidal shaped, soft pink flower plumes which stand out in the night garden. Divide astilbes in the autumn after flowering or in early spring. To lift a perennial with minimal root damage, begin digging at its drip line. Jennifer Loucks has been writing since 1998. The … Start at the drip line. Astilbe ‘Fanal’ $7.19 - 1 gallon ... and fruits; and dividing spring flowering perennials. Wait until plants emerge at least 4 inches from the ground. Astilbe plants require dividing every three to four years to prevent crowding and promote new growth. We just received a shipment of some nice ones from our farm. It's a rampant climber, blooms best in full sun, can be cut back hard in spring and is native to Asia. Replant your new divisions in a shady spot, 1 – 3 feet apart. Choose a location that has partial to full shade and well-draining soil. Subscribe to cleveland.com. Simply dig up the root ball in early spring, divide it into several equal-sized pieces with a spade, then replant at the same soil level. Will dividing them help and, if so, how and when should I do it? Fertilize. Spring is the best season to do it. What was I looking for? However, division is most successful when the plants are not in active growth. Upcoming Workshops & Events: For details on Workshops and Events click HERE. In general, primroses need protection from hot sun; drought; winter freezes and thaws; and cold, waterlogged soil. Divide healthy, large plants every few seasons in the garden. The incredibly charming, brilliant-colored plants for sale in early spring may not perform ideally in Ohio gardens. Pink may be harder to distinguish without flowers. Most are early-season bloomers, emerging in late spring or early summer. Ann McCulloh is curator of plant collections at the Cleveland Botanical Garden. Choose a location that has partial to full shade and well-draining soil. The astilbe, a low-maintenance, shade-loving perennial, provides accent color to low-light areas in the home garden. Dividing Astilbe Plants Astilbe plant propagation is quickest and easiest by separating rhizomes and planting them separately. Spring is the best season to do it. Water plants during the summer if rainfall is less than 1 inch per week. A single asterisk indicates that division should take place after the plant flowers. Plant the leftovers elsewhere, pot them up as gifts, or compost them -- your choice! You're in luck! Loucks also trains for full marathons, half-marathons and shorter distance running. Astilbes are reliable perennials, but they do benefit from being divided every few years. Plant divisions in the spring or fall about 1 to 3 feet apart, depending on the type. Fertilize with composted cow manure after flowering, and renew the mulch layer in the fall. When to divide perennials. Mulch with another inch of compost. Before digging, water the soil thoroughly, so that it will be soft, … The deliciously fragrant one is 'Clematis terniflora,' sweet autumn clematis. It is easier to plant divisions from other astilbe plants. Q: My bearded iris didn’t bloom well this year.I suspect they are overcrowded. To divide your plant, you need to carefully dig up the whole root ball getting as many of the roots as possible. Astilbe responds well to dividing. In wet autumns, delay until spring. Divide plants every 3 to 4 years as new growth begins in the spring, lifting plants and dividing them into clumps. Pruning your astilbe yearly does not prevent growth and spread of the mound of underground roots. She now writes hobby-based articles on cooking, gardening, sewing and running. Pot up your divisions before planting out. Discard any dead or diseased portions of the rhizomes. Gently separate root clumps that form off the main root crown. The astilbe spreads with rhizomes underground. Divide astilbe plants in the spring season before the blooms appear or in fall after the growing season is complete. Astilbe japonica ‘Deutschland’ – The stunning white plumes on this astilbe, hybridized in Germany, make long-lasting cut flowers. Beginning in early spring and continuing through. She holds a Bachelor of Science in animal science and business from University of Wisconsin-River Falls. Avoid summer planting due to astilbe's aversion to drying out. Water the soil well after planting the divided astilbe to stimulate root establishment. late fall, ... by dividing total mass, total C, ... Laportia canadensis, Astilbe biternata, Viola rotundifolia, Water them well within 24 hours before dividing. Community Rules apply to all content you upload or otherwise submit to this site. Astilbe grows best in an acidic soil with a pH of approximately 6.0. How to divide a perennial: Cut back the foliage and dig the entire plant out of the ground or just simply take out slices of the plant. Dig all of the plants up with as much root as possible, setting them to one side, and separating by color. Fall division should take place between early September in the uppermost Piedmont and mid- to late October on the coast. I tried to find a fall-blooming clematis vine, which has white flowers and the perfume of jasmine. Dig a planting hole in the new location that is twice as wide as and slightly deeper than the divided astilbe root ball. Then use a sharp knife or pruners to cut the rhizomes into 12 inch sections. Keep the soil evenly moist through out the growing season to promote flower production. Astilbe chinensis ‘Pumila’ – Choose this low-growing astilbe if you need an attractive groundcover; it tops out at about six inches high, with lavender flowers that grow to 12 inches. When dividing perennials, timing and technique are important. 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