Grassy and herbaceous (green) residual biomass is often not suitable for direct higher-value material or energy use due to its physico-chemical properties. This is due to their low digestibility and fermentability on the one hand and the high concentration of minerals on the other. These residual biomasses also exhibit a high degree of spatio-temporal variation in their physico-chemical properties. Accordingly, adapted processing is required for standardized use of these residual biomasses.