Leave them for winter wildlife if you can. A mass of coneflowers (Echinacea purpurea) adds a pop of color to a sunny garden from summer and well into fall. With stems that can grow from 18 inches to 4 ...

Prune Knockout roses heavily in late winter or early spring as new growth begins. Lightly deadhead and shape in late summer, stopping two months before frost. For annual pruning, cut back one-third of ...