Grapes Alive! supports long-term plant and soil health by providing a wide range of nutrients and a diversity of nitrogen sources. The result is better quality fruit with fewer applications. This all-natural grape and muscadine fertilizer was developed by biochemist and vineyard owner, Dr. Bill Sadler. If applied in the spring, the following rates are enough for one full year. If you choose, you may add a second application in late summer. 1 lb. per 10 ft. of linear vine, 1 lb. per 100 sq. ft., ½ lb. per individual established plant.