Grow More of 20-10-20 Urea Free Must be dissolved in water before use. Dissolve 1 teaspoon per gallon of water. Use hose-end proportionate, sprinkler can or bucket to apply water copiously to saturate bark or other potting media every 10 days or 2 ?weeks.? Pre-water plants the day before feeding if soil or bark is dry.? For more details about your particular orchid?