Hydrangeas that bloom on old growth (like “Endless Summer”) should be pruned immediately after they’ve finished flowering. Hydrangea is an illusive shrub that can be pruned in the late winter/early spring or just after they’ve finished blooming, depending on the variety. Butterfly Weed (Asclepias), Ferns, and Heuchera (Coral Bells) should be left until spring because the foliage helps protect their crowns.Sedum and Ornamental Grasses should be left throughout the winter to add height and interest.Echinacea (Coneflower) and Rudbeckia (Black Eyed Susan) should be left up until spring to attract and feed birds throughout the winter.This should help them drop some seeds for the next season. If you can’t stand leaving them up (or are part of an HOA that makes you cut them back), cut them back and leave the debris on the ground. If you planted annual wildflowers like Cosmos, Zinnias, or Sunflowers, leaving them up through the winter helps them to drop their seeds and come back the next year. There are several common perennials that should be left up throughout the winter for a variety of reasons, including protection, adding winter interest, and helping local wildlife. Perennials To Leave Up Through The Winter Make sure to clean your pruners with a mixture of bleach and water after dealing with any diseased plants. Throw it away or dispose of it in an area far enough away from the garden that other plants won’t be subject to the disease. If perennials (like Bee Balm or Phlox) were diseased this past season, cut the foliage all the way down to the ground and don’t compost it. Prune foliage down to just a few inches from the ground and make sure to clear away any debris from the garden to help prevent disease and rot in the early spring. There are a variety of perennials that should be cut back in the fall. We’ll go over a sampling of common perennials here in Vermont and list when to cut them back (and why). Other varieties offer up important habitat for local wildlife and some perennials provide height and interest through the winter months. It’s common to think that everything should be chopped down to the ground in the fall, but some perennials actually need their foliage to protect new shoots through the winter. In late fall, once all of your perennials have started to turn brown and die back, it’s time to prune some and leave some to cut back in spring.
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