Preparing Perennials for Winter: Mulching, Cleanup, and Planning Ahead

In gardening, winter begins when most perennials go dormant—anytime from early September to late December depending on region. Cold is the primary dormancy trigger, so understanding your local cold patterns is crucial for winter preparation.

Tips on Mulching

If your area gets reliable snow cover, you’re lucky. Snow—“poor man’s mulch”—insulates the garden, keeping ground temperatures around 32°F while air temps plunge below zero. Dormant perennials at a constant temperature rarely suffer winter damage.

In areas with little snow, plants can suffer during unexpected cold snaps. Apply a 2–3 inch winter mulch—preferably organic (shredded leaves, pine needles, licorice roots)—after the soil freezes. Mulch protects from unusual cold and prevents premature thawing and frost heaving.

Before mulching, clean the bed thoroughly: remove dead foliage and destroy weeds. Then step back and assess. If you’re planning improvements, mark where new perennials will go and label each marker with the intended plant name to simplify spring planting.