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Hosta When to divide? Plant, transplant and divide hostas either in the early fall or in spring before leaves unfold. While hostas can be successfully divided at any time that they can be dug, they will need much more care if divided during summer heat. Divide hostas by either cutting away a section of a clump with its roots or by lifting the clump and separating it. Be sure to use clean, sharp tools. Replant the new plants promptly and water well. Space plants 1 to 3 feet apart, allowing room for growth. Hostas do best when left undisturbed for several years. Reference(s): |