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| Question Number: 169 | Type: Maintenance/Moving and Dividing Perennials |
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 | When is it safe to move perennials (general guidelines please)? I started my garden last summer and I now realize (late May) that many were planted too close to one another, and it's getting crowded. Toronto, Ontario (Zone 5). |
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 | Many perennials can still be moved and/or divided in late May. Cool rainy weather is particularly a great moment for it. In general, I like to move late summer and fall bloomers in the spring, and early spring to mid summer bloomers in early fall. This results in plants that still bloom at their "normal" time. The exceptions are Peonies (fall only), true Lilies (fall), Oriental Poppies and Bearded Iris (both in August).
If you were to move, say, a clump of Rudbeckia in late May, be sure to cut the foliage back by at least half, to compensate for the roots that will be lost. This helps to keep the ratio of root to top in balance, and avoids undue wilting and collapsed plants. The plants will quickly grow new leaves. This will even work with things like Hosta or Daylilies, and most other summer bloomers. -- John Valleau |
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