Boca Hydro LLC Amazon.com : Greenway Biotech, Inc. Lettuce Fertilizer 8 15 36 Powder Water Soluble with Chelated Micronutrients for Lettuce Kale Spinach Microgreens Helps Prevent Tip Burn Hydroponics or Soil 1 LB : Patio, Lawn & Garden Advanced 16 4 8 Lawn Fertilizer Liquid Lawn Food Spring & Summer Concentrated Spray Any Grass Type Fish and Seaweed Kelp Balanced NPK Simple You're putting the same fertilizer on every plant in your garden. The lettuce that needs nitrogen for leaves is getting the same feed as the tomato that needs phosphorus for fruit. Different