Article: Apply mulch around perennials after freeze.(Home & Garden)(Ask a master gardener)

Q. I noticed my neighbor applying mulch to many of the perennials in his garden. I remember reading somewhere that you should not apply mulch too early. Is that true? Why?

A. You are correct. Mulches should be placed on perennials after the ground freezes and remains frozen. This occurs when nighttime temperatures drop to the teens for several nights in a row.

Many people incorrectly think that mulch keeps the ground and plants warm. The purpose of mulch is to insulate the soil and keep the ground evenly frozen until the final spring thaw. Mulch also keeps the plants from drying out by winter winds.

In the Chicago area we often have repeated ...

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