Green Manure is a plant that can be grown on all types of Farms. It produces no foods but increases Soil Fertility and the yield of other crops rotated with the Green Mature. It takes 3 months to reach maturity and can survive for 4 months without Water. Green Manure represents the only method for maintenance of Soil Fertility before Fertilizer is readily available. After the Green Mature is replaced by Fertilizers, it is still the only way to avoid the penalty for lacking rotation in case of producing only 1 crop.