Humbolts Secret Plant Nutrients have been used by professional growers for over twenty years. Their signature Golden Tree plant metabolism booster stimulates and enhances the development and growth in plants by increasing nitrogen assimilation and basal metabolism. For growers who like to use an enzyme additive, give the Humbolts Secret Plant Enzyme Formula a try. HTG Supply offers only the best nutrients from the industry’s top brands. Shop Humbolts Secret today for premium quality plant nutrients and additives to suit your specific gardening needs!