Do not apply the mulch too early in the fall as it can increase crown rot. Early mulching also can prevent the plants from completely going dormant, making them more subject to winter injury. Suitable mulches include newspapers, coarse sawdust, straw, hay or any loose mulch, i.e., one that does not compact. Remove the mulch in the spring after the new growth occurs. While one can delay blooming by maintaining the mulch layer, too late a removal reduces yield.
Row covers are an effective winter mulch.
Unlike straw mulches, light penetrates the mulch layer, increasing the number of blossoms formed and the yield. One disadvantage to floating row covers is that they accelerate flower development. Be prepared to protect blossoms from late frost. Remove the mulch to allow for pollination, but recover the plants at night when frost is predicted. Be sure to remove only enough mulch to expose the leaves.