The Garden Bug: Cutting back perennials

By Brenda Weaver

When it comes to perennials, don't cut them back until after several hard frosts. The roots are still reclaiming energy for healthy growth in the spring, and the decomposing leaves insulate the plant during freezes and thaws and provide fertilizer for spring growth. Leave seedheads standing to feed the birds in cold weather. However, you should remove dead foliage containing pests or disease.

Source: www.almanac.com