Winter Mulching Perennials: Keep the Bark, Add Light Layer If Needed

Don’t Remove Existing Bark Mulch

Your nursery-installed bark is doing its job. Winter mulch goes on top, not instead of.

Zone 5 Perennial Bed (Lilac, Hydrangea, Knockout Rose, Echinacea, Astilbe, Lavender)

• Bark mulch + snow cover = sufficient for most.
• Extra 1–2 inches of straw/leaves only around hydrangeas (more tender).
• Others are tough—knockout roses, lavender, echinacea laugh at Zone 5.

Spring Cleanup

Rake back excess in early spring. Replenish bark as it decomposes. No need to swap materials seasonally.

Pro Tip

Mulch after ground freezes (prevents rodent nesting). Keep mulch off crowns/stems.

Your bark is fine. Add a light blanket only where needed. Simple.