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The U.S. Department of Agriculture provides gardeners with plant hardiness zones to help them determine what plants will thrive in their climate. Michigan, a large state in the Midwest, reflects several growing zones.
Soil temperature is an important factor in seed germination and emergence. Together with soil moisture, the temperature determines the ideal planting time for many Michigan crops. The minimum threshold temperature for corn seed germination is 50 degrees F in the seed zone.orn will germinate and emerge slowly and unevenly when soil temperatures are less than 50 degrees F. Thermal time from planting to emergence is approximately 115 growing degree days (GDDs) based on air temperature or about 119 GDDs based on soil temperature using the modified growing degree formula (Nielsen, 2008).