Once seeds sprout, mix The Mushroom Stuff^® 1 tsp/16 oz slightly warm water, put in RTU bottle and spray trays carefully. Put warm water in another RTU and spray over the same trays. Do the same with Earth Right Super Stuff^® about a week later. After these applications, use Sure Bloom at double that rate when watering. The amount of times you fertilize your trays will depend upon what you are growing and the size of the plug or pot. Remember a little bit goes a long way with seedlings.