Custom-blended formulas for the crops you actually grow.
Fertilizers, Hydroponic Nutrients & Magnesium Wellness
For your garden
Fertilizers & plant nutrition
Custom-blended formulas for tomatoes, greens, citrus, lawns and hydroponics.
For your body
Magnesium & personal care
USP-grade magnesium chloride, magnesium oil, Epsom salt and MSM.
Buying in bulk or for your own brand?
50 lb bags, pallets, custom blends and private label. Quotes in 3–5 business days.
Family-owned in California
Family-owned in California
Family-owned in California
Family-owned in California
Family-owned in California
Family-owned in California
Family-owned in California
Family-owned in California
Family-owned in California
Family-owned in California
Shop by Crop
Tomatoes & Fruiting Vegetables
Bigger fruit, deeper flavor, more abundant harvests. Works for tomatoes, eggplant, melons, and squash.
Lettuce & Leafy Greens
Tender, fast-growing leaves with rich color and density. Ideal for lettuce, kale, spinach, and chard.
Peppers & Herbs
Stronger flavor and bigger yields for peppers, basil, cilantro, mint, and culinary herbs.
Strawberries & Berry Crops
Sweeter, juicier berries with bigger harvests. Built for strawberries, blueberries, and bramble fruits.
Cucumbers & Vine Crops
Crisp, productive vines with steady harvests. Ideal for cucumbers, zucchini, and squash.
Azaleas, Camellias & Acid-Loving Shrubs
Vibrant blooms and lush foliage for plants that thrive in acidic soil. Built for azaleas, camellias, rhododendrons, hydrangeas, and blueberries.
Why Greenway Biotech
Greenway Biotech, Inc. is a family-owned fertilizer and USP magnesium company based in Madera, California, and has been in business in California since 1989. We blend our own formulas and pack every product in our own FDA-registered facility, so you buy straight from the source, not a reseller.
Our fertilizers are CDFA-registered, custom-blended NPK formulas with chelated micronutrients. Every batch is third-party tested for heavy metals, with results available on request. Our magnesium products are USP pharmaceutical grade with no fillers.
We've shipped to gardeners, hydroponic growers, and commercial farms in all 50 states, and we manufacture private label and contract blends for other brands. Thousands of verified customer reviews, three decades running.
Not Sure Where to Start?
Take our 2-minute quiz — we'll match you to the right fertilizer for your crop, soil, and goals.
Magnesium Chloride USP — Dead Sea Pharmaceutical Grade
- Regular Price
- from $ 19.99
- Sale Price
- from $ 19.99
- Regular Price
- $ 19.99
- Unit Price
- per
Monopotassium Phosphate 0-52-34
- Regular Price
- from $ 29.99
- Sale Price
- from $ 29.99
- Regular Price
- Unit Price
- per
Tomato Fertilizer 4-18-38 | Chelated Micronutrients | Hydroponics, Soil & Foliar Application
- Regular Price
- from $ 24.99
- Sale Price
- from $ 24.99
- Regular Price
- $ 24.99
- Unit Price
- per
Chelated Iron DTPA Fertilizer 11% Fe
- Regular Price
- from $ 31.99
- Sale Price
- from $ 31.99
- Regular Price
- $ 29.99
- Unit Price
- per
For Your Body, Not Just Your Garden!
USP-grade magnesium and personal care, packed and made in the same FDA-registered California facility.
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Best Fertilizer for Lawns: Nitrogen Rates, Timing, and Iron by Grass Type
Bagged four-step programs rarely fit one lawn well. Match fertilizer to your grass type and soil test: calculate actual nitrogen, time feedings by season, correct alkaline-soil yellowing, and use iron for color, not growth.
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Best Fertilizer for Houseplants: Rates, Timing & Salt Buildup
Light and active growth set the feeding rate for houseplants — not the calendar. Covers the 3:1:2 ratio, how much to feed by light level, tap water and alkalinity problems, salt buildup and flushing, and when not to feed at all.
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Best Fertilizer for Avocado Trees: Rates, Timing & Salt Sensitivity
Avocado feeding runs by different rules: shallow roots that burn on heavy doses, extreme chloride sensitivity, and UC research showing timing around bloom matters as much as amount. Rates by age, zinc fixes, and root-rot checks.
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The Healing Garden: A Nurturing Guide to Mental Wellness Through Plant Care
Clinical research shows gardening and plant care significantly reduce depression, anxiety, and stress. Learn which plants offer the most therapeutic value and how to build a healing garden — from a single houseplant to a full backyard retreat.
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The Ultimate Guide to Deep Hydration: Ingredients for Silky Smooth Skin (2024)
The Ultimate Guide to Deep Hydration: Ingredients for Silky Smooth Skin (2024) Whil...
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Exploring Lavender Essential Oil: Health Benefits, Uses, and Extraction Methods
Learn more about lavender essential oil, its uses and benefits for your health, here.
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What is the best organic way to get rid of moss in your lawn?
Ferrous sulfate effectively controls moss in lawns while improving grass health. This guide covers:
- Moss characteristics and affected grass types
- Specific mosses and weeds targeted
- Preparing and applying ferrous sulfate solution
- Application frequency and post-treatment care
- Fertilization with ammonium sulfate or urea for lawn recovery
The article provides step-by-step instructions for mixing and applying ferrous sulfate, including timing, method, and frequency. It also offers tips for maintaining a healthy lawn to prevent moss regrowth.
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DIY Rosemary and MSM Powder Spray to Boost Hair Growth
Learn how to make a rosemary and MSM powder spray for hair growth.
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Sweet Dreams in a Glass: The Sleepy Girl Mocktail Recipe
Make the popular tart cherry juice mocktail.
