Green manure is a crop that is planted in the fall; its purpose is to improve soil fertility and tilth in the spring. I have just seeded a fall green manure mix from Johnny’s Selected Seeds in three of my newly weeded and watered (thanks to the rain) garden beds. This mix contains annual seeds like crimson clover, annual rye grass and yellow peas, as well as winter rye and hairy vetch that will go dormant but begin…