For a summer green manure, till in after blossoms have been enjoyed by the bees. For grain, sow 3 months before fall frost, harvest after killing frost and let decompose during the winter. Till in during the spring.
Use of hairy vetch—prevent weeds in squash beds
This can often include winter rye, oats, clover, field peas, and hairy vetch. The peas, oats and clover die at frost, providing biomass and soil cover. The hairy vetch and winter rye regrow in the spring to provide nutrients for new crops.