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All perennials, roses, mums, and strawberries should be uncovered by March 15, as long as temperatures are staying above 15 degrees.

By uncovering this early allows the stems and buds a chance to adapt to sunlight and current air temperatures before they start to grow. Leaving plants covered too long will cause stems and leaves to be soft, possibly stretching, and the plants will then be more susceptible to disease and damage from late freezes. Uncovering too early may cause freeze damage to the growing tips and root systems.

If temperatures are predicted to fall below 15 degrees after uncovering in early March, be prepared to temporarily cover these plants again with mulch, leaves, sheets, or burlap until the cold snap is past.