Greenway Biotech

Greenway Biotech, Inc. is a family-owned manufacturer based in Madera, California, making fertilizers and USP-grade magnesium products since 1989. The company produces its products in its own FDA-registered facility and serves home gardeners, hydroponic growers, commercial farms, and customers seeking personal care and wellness products.

Its fertilizer range includes custom-blended NPK formulas with chelated micronutrients, water-soluble and organic options, hydroponic nutrients, and specialty crop blends. Products are organized for a variety of plants, including vegetables, leafy greens, berries, flowers, fruit trees, houseplants, and lawns. The catalog also includes individual nutrients such as nitrogen, phosphorus, potassium, calcium, magnesium, and chelated micronutrients. Beyond gardening, Greenway Biotech offers USP-grade magnesium, essential oils, skin care, and supplements.

The company states that its fertilizers are CDFA-registered and that every batch is third-party tested for heavy metals, with results available on request. It also provides fertilizer-selection tools, growing guides, and deficiency resources, and offers wholesale, private-label, and contract-blending services. Greenway Biotech ships throughout the United States.