Crimson Clover Seed: Untreated, Non-GMO, 1 lb. Non-GMO, Untreated Crimson Clover Seed Excellent for attracting bees, erosion control, green manure, nitrogen fixation, no till and weed suppresion. Plant in fall or spring for quick ground cover. 1 lb. bag will cover approximately 1,000 square feet. Always Fast & Free Shipping.