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The herbaceous border is best cut back in fall, around late October.Cut all the old tired flower stems and foliage down to a couple of inches and recycle in the compost heap.
One of the few exceptions to this rule is the red hot poker or Knifophia.For winter protection from the cold and wet,gather up the foliage antie it together.This prevents the crowns rotting off.
Tender plants such as the foxtail lily or Eremurus should have their crowns protected over winter, by covering them with a thick layer of sand.this can be removed in spring , when the new shoots are showing.
It's a good idea to label clumps which you want to split up later on.
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Jennifer Mathes, Ph.D. |