Wait to cut back asparagus until ferns turn brown so the plant stores enough energy for next year. Prune after the first frost, or delay until early spring if ferns stay green. Never prune once new ...

Don’t prune Black Eyed Susans, sunflowers, or ornamental grasses—they add winter interest. Mums, geraniums, and Christmas ferns stay colorful or green, so no trimming is needed. Wait until spring to ...