Trifolium alexandrinum One of the best nitrogen fixers, making 200–300 pounds per acre available. Extremely productive, it is an excellent forage as well as a green manure. An annual with ivory blossoms, Berseem will tolerate a wide range of soils and temperatures down to 15°F. Plant late summer to get the best winter cover, sow 1/2 inch deep.  Height: 18-30 inches. Recommended seeding rate: 1 pound per 1000 square feet; 15–20 pounds per acre. Pre-inoculated.

Available only in the contiguous US.