Humboldt's Verde is a supplement designed to increase and improve the vegetative growth of your plants. Specifically, this organically derived supplement increases root, stem and stalk structure, while boosting chlorophyll levels. The fast acting ingredients; calcium, iron, magnesium, other minor elements and vitamins with help you achieve lush, green colors and vigorous growth. Also, accessible nitrogen is the key to a plant having a strong and vibrant internal structure. Plant growth can't go wrong when using Humboldt Verde! Quantity: 1 Quart.