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Fall is garden cleanup time, but that doesn't mean you should turn your property into a barren wasteland.
PLANTS TO KEEP
Leave perennials that produce seed heads standing over winter to feed nonmigratory birds and provide shelter for pollinators and beneficial insects.
These include allium, aster, big-leaf lupine, black-eyed Susan, chocolate flower, coneflower, goldenrod, milkweed, rattlesnake master, sneezeweed and trumpet vine, among others.
Most spring-blooming shrubs produce their flowers on "old wood," which is the prior year's growth. Cutting them back now would inadvertently remove those burgeoning buds. So avoid trimming azaleas, rhododendrons, forsythia and hydrangeas now. (If any spring-bloomers need pruning to maintain or restore a desirable shape or size, do it no later than two weeks after their spring flowers fade).
Ornamental grasses, too, should be left standing over winter until their spring growth resumes. They provide valuable habitat for overwintering beneficial insects and give you something nice to look at as they sway in winter winds.
Pushing fallen leaves into garden beds will provide even more shelter for those insects, which will pay you back in spring when they attack pests that would otherwise decimate your plants.
Woody or semi-woody perennials, such as Russian sage and lavender, should also be left standing through winter, as their top growth protects their crowns (the juncture where the above-ground part of the plant meets the roots) from frost damage.