Cold frames are something of an afterthought for most gardeners, and their various designs are indicative of what some would call Yankee Ingenuity. The simplest might be a hole in the ground with a glass cover – usually an old window frame – though it might have sides raised by hay bales destined to provide mulch after the plants are in the ground. The general idea is to be resourceful, and provide a place to harden off your seedlings while protecting them from a late frost.
Warm Up Your Seedlings with a Cold Frame
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