In some years, freezing temperatures may damage spring bulbs such as tulips, crocus and daffodils that emerge early in the season. Bulbs located near a foundation, especially on the south or west side of a building, or on a south facing slope, are most susceptible to early emergence and, therefore, freezing damage. The soil on these sites can heat up in very early spring, causing leaves and flower buds to emerge too soon. If air temperatures then drop into the 26-28 degree range, the leaves or buds may be damaged or killed.

To prevent freezing damage to spring bulbs, avoid planting your bulbs against foundations or on south-facing exposures if possible. Existing plantings on susceptible sites should be mulched in the fall after the ground has frozen. A 6-inch layer of straw or shredded leaves makes a fine winter mulch.

To protect an unmulched planting during freezing weather in early spring, place a layer of polyester row cover material or a sheet or light blanket over the emerging bulbs at night. Polyester row cover material may be left in place for extended periods, while a sheet or blanket should be removed each morning once temperatures have risen above the freezing point.

Finally, if cold weather is forecast when the flower buds are about to open, consider cutting them for indoor enjoyment. For more gardening information, visit the University of Minnesota Extension Service Yard and Garden Line Web site.

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