Green Planet GP3 Micro 5L This unrivaled 3 part nutrient system consists of a combination of primary, secondary and micronutrients in three separate formulas: Grow, Micro and Bloom. GP3 Micro is the component of the GP3 nutrient system that provides your plants with the essential and supplemental nutrients they need in the grow and bloom stages of growth. Our Micro formula contains ethically sourced ingredients, no synthetic dyes, and features an extensive range of guaranteed micronutrients to ensure your plants are getting the highest quality food possible. These include necessary elements such as iron(Fe), boron (B) and calcium (Ca), all of which benefit the plant throughout its entire life cycle. Iron is necessary for a plant's enzymes to function and helps chlorophyll synthesize. Boron improves the structural integrity of cell walls, which keeps stems, stalks, and branches robust and healthy. Calcium plays a major role in the development of rigid cell walls that can support large yields. The stronger cell walls also boost your plant's immunity to diseases and stress. When used alongside GP3 Grow and GP3 Bloom, your plants will receive the primary, secondary, micro, and macronutrients they need for a bountiful harvest.