Peter’s 20-20-20 General Purpose Fertilizer with Micro Nutrients. Net weight 1 pound. It helps promote green foliage fast thanks to a high percentage of ammonium, nitrogen, phosphorous and potassium. Suitable for use on all flowers, vegetables, shrubs, trees and houseplants Instructions Take 3 teaspoon NPK 20 20 20 Fertilizer. Add it in 5 Liters of Water. Mix the solution well. Add 1 cup per plant per week (or 3 week for small plants) Gradually increase the quantity and frequency. Start with small quantity and increase based on response.