Plant Fertilizers, Nutrients & Additives for Gardens & Greenhouses

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Support strong, vibrant growth with premium fertilizers, nutrients, and additives. From balanced NPK formulas to Cal-Mag supplements, root stimulants, bloom boosters, and microbial enhancers, these products help your plants thrive in any system—soil, hydroponic, or container. Feed your plants exactly what they need, when they need it. Need to build better soil first? Browse our Soil and Soil Amendments for essential ingredients that strengthen your growing foundation. Feed gardens well by adding high-quality plant fertilizer from Greenhouse Megastore. We have leading brands like Jack’s, Espoma, Pro-Mix and Earth Science to supplement everything from house plants to commercial landscapes.