Crimson Clover Seed: Untreated, Non-GMO, 5 Pounds 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. 5 lb. bag will cover approximately 5,000 square feet. Always Fast & Free Shipping.