It's getting late in most of the country to plant a vegetable garden, but certain crops can thrive if planted late in the summer.
Check with your local garden supply store, or agricultural extension service for advice for varietals that will survive best in your climate. Buy seedlings to give yourself a head start if it's too late to plant from seeds.
If it's too late to plant a garden for harvesting, the University of Minnesota Extension recommends planting "green manure":
If its too late to plant a second crop of vegetables, you may want to plant green manure to keep the area weed-free, prevent soil erosion, and add organic matter to the soil. Green manures include legumes such as vetch, alfalfa, clover, and peas; grasses such as annual ryegrass, oats, winter rye, and winter wheat; and broadleaf plants such as rapeseed and buckwheat. Sow seed thickly to create a cover that wont allow weeds to compete. Mow these crops down if they flower before theyre killed by frost, to prevent them from self-seeding and becoming weeds.
In late fall or early spring, turn dead plant material from green manures into the soil before sowing seed or planting seedlings. This is also the time to add fertilizer to the soil. If the green manure is one that doesnt die over winter, wait about two weeks after you turn in the living plant material before seeding or transplanting your crops.
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