Q.When To Start Corn Indoors Zone 4.
It’s not shown on your list on when to start germination indoors for corn.

BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on February 22, 2021
Indoors, for corn, you will want to start them 4-6 weeks before May 15, your last frost date. Keep in mind that this is just a guidelines, and it could still freeze after that date.
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