Perennial crops have been shown to reduce annual weed populations, but do diverse perennial forage mixtures affect weed seed mortality in the soil seedbank? Treatments include monocultures and mixtures of alfalfa, chicory, and orchard grass and their impact on buried pigweed and velvetleaf weed seeds. Preliminary results suggest that composition and diversity did not significantly affect weed seed viability.  However, higher proportions of alfalfa biomass in a mixture correlated with decreased pigweed viability.