When should I plant in Michigan?

It depends on your location. Michigan's planting zones vary, from Zone 3 in the western Upper to Zone 6 in a small region of the eastern Lower. Use this map to determine your zone or visit a gardening site that can provide your zone info based on Zip Code:

Map:

http://msuplants.com/SaylorPlants/Ref_Info/USDAMap33c_Michigan_Area_lo.jpg

Enter your zip at the top:

http://www.naturehills.com/