With this fertilizer, your greenbox plants will grow even better. We recommend the GreenBox booster if you want to enjoy the harvest faster - the new GreenBox fertilizer makes the plants in your indoor garden grow almost twice as fast. Dosage: 1 cap to 1.5 liters of water with each irrigation. Composition: NPK fertilizer solution 3-1-5, 250 ml bottle Free shipping within Germany from 30€.