Producers wanting to add to or improve forage in their existing pastures should consider using either the frost seeding method in February and early March, or interseeding in later spring months. The frost seeding method involves spreading forage seed on existing pastures during the late winter or very early spring while the ground is still frozen. Freeze-thaw cycles, with help from early spring rains, then provide shallow coverage of the seed.
Iowa State University
Barnhart, Stephen K., "Consider Frost Seeding or Interseeding Pastures This Spring" (2009). Integrated Crop Management News. 717.
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