An unprecedented period of sub-freezing temperatures in early April 2007 across the upper Midwest states has raised questions about possible cold injury to forage crops. It has been obvious that new spring regrowth of alfalfa and some clovers has been frozen. The unknown at this time is whether there has been any lasting damage to alfalfa, clovers, or orchardgrass crowns and roots. Early indications are that there has not been widespread winterkill.
Iowa State University
Barnhart, Stephen K., "Assessing freeze damage to alfalfa and management suggestions" (2007). Integrated Crop Management News. 1113.
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