NutriPak Fertilizer for Trees and Evergreens, 16-8-8 (3 Year Controlled Release) Plants will receive the correct amount of fertilization without the guesswork Simply bury the scientifically designed perforated packet next to the root system of the plant to be fertilized Nutri Pak 16-8-8 for trees, shrubs and evergreens - Can be used during planting and on established plants Application rate is 1 Nutri Pak per inch tree caliper or 1 foot of shrub height Packets are 2 oz. (or 56.7 grams) - 3 year, controlled release formula (lasts 3-4 years)