Green Manures are a bit of a mystery to me, but fortunately I’m not allowed anywhere near the plants, and the rest of the team are wise in the intricacies of soil.
Green Manure is a winter thing for Growing Well, and this year we’re using Rye Grass and Vetch. These plants grow quickly, and absorb nitrogen from the air and ‘fix it’ in root nodules on their roots so that when it is dug in it becomes available to the following crop. Their deep roots also open up the soil, helping drainage and reducing compaction by heavy rain over the winter. Apparently Green Manures were always used up until the Second World War when chemical use took over in popularity, but now organic growers like Growing Well are making good use of old school knowledge.