Teske's Best . . .Most Popular. . . All Organic Fertilizer. Lawn Sustane 5-2-4 is all natural organic 80% slow release nitrogen fertilizer. OMRI liscenced. Allowed for use on certified organic food and fiber crops. Sustane is made from aerobically composted turkey litter, hydrolyzed feathermeal and sulfate of potash. Organics are an absolute must in shade areas. Fast release nitrogen in shade will cause conditions in which disease will thrive. Save yourself the trouble and only use organics in shade. Sustane is our best. We have loved it for years. One 50 lb. bag will cover 2,500 sq. ft. of lawn. Use the higher nitrogen formula for lawns. When ordering, please let us know if you need the lawn formula or the garden formula. Garden Sustane 4-6-4 is the best formula for gardens, trees and shrubs. This is important for flowering plants and food. Using the lawn formula on your garden may cause you to have very large plants with very few flowers. Remember, when you are using an organic fertilizer you are improving the soil long term so you will get benefits for years to come, not just for the next few weeks. This is a renewable resource.