NEW! Clover Seed. Organic Mammoth Red. (Trifolium pratense var. sativum) Biennial or short-lived perennial legume that is faster-growing, larger and grows over a wider range of soil conditions than Medium Red Clover. Tolerates fairly acid soils. Long taproots excel at opening up compacted subsoils and pull up nutrients from deep in the soil. The large plants make prodigious quantities of organic matter. A well-grown stand can fix up to 200 pounds N per acre! Excellent plowdown cover crop. However, thick stems limit its value for hay. Like all clovers, Mammoth is loved by bees and other pollinators. Seed ½ lb./1000 sq. ft. or at 15 lbs. per acre, 248,000 seeds/lb. Pkt. Plants 12 sq. ft.