Jack's Professional 15-16-17 Peat-Lite Water Soluble Fertilizer, 25 lbs.Jack's 15 16 17 is a nice variation of Geranium Special 15 15 15 with slightly elevated micronutrients. With a ratio similar to 20 20 20 but with over 60% nitrate nitrogen, boosted micronutrient levels, and much less acidic reaction in the root media. The balanced N P K ratio is excellent for producing fast growing plants or for maintaining plants in a sales environment. For Use On: All plants Jacks Professional 15 16 17 Peat Lite Water Soluble