Sow all year in Spring, Summer, Autumn for a lush coverage of green foliage that builds organic matter in your soil and helps to suppress weeds. Sowing green manure seed on open areas of soil will smother out weeds and provide ground cover to protect the soil. Improves soil structure by adding organic matter to your soil.  Sow at 5 grams per square meter and rake into the surface.  Simply cut or mulch the plants before they flower and then turn them into the soil.