An annual alfalfa discovered by University of Minnesota researchers. It is superior to regular perennial alfalfa for nitrogen fixing because it does not enter dormancy and continues to fix nitrogen until it is killed by frost. In tests, Big N provided 124 pounds of nitrogen per acre versus 85 pounds per acre for dormant varieties. If planted in the spring, you may wish to cut the alfalfa several times and compost it. Great for forage. If you have garden space you don't want to use or new ground, a year of this will really improve the soil.Big N Alfalfa is not treated with inoculant. Grows about 3 feet tall. Sow 1/2 lb. per 1,000 sq. ft.