Growing a nitrogen lifter and a fixer together is the best way of improving soils over winter. Rye and Vetch are excellent companions and usually very reliable. Variety RyeVetch over winter mix. Covers approximately 10.Why sow Green Manure Bigger, more prolific crops green manures will lift or fix nitrates into your soil to provide this essential element for your harvests Easier digging deep rooting green species can help to loosen and aerate soil Reduce the need to use chemical fertilisers environmentally friendly Less weeding assists with keeping weeds down! Less chemical pest control helps control pests and provides shelter for beneficial insects Can suppress soil borne pest and diseases!