One very easy method of winter gardening is to create a simple hotbed and grow
winter-hardy greens in it. To do so, simply dig a pit about a foot and a half
deep; fill it with about 12″ of green manure or any green material, even weeds;
top with about 4″ of soil or compost, leaving the top slightly below ground
level; and cover the indentation with glass or any solar box. The hotbed doesn’t need to be big
to produce greens you can eat all winter.