You are viewing all Organic Growers Supply products related to “Soil Amendments.”

Custom Mixing
Amendments and Fertilizers

Tired of ineffectively mixing fertilizers or potting soil ingredients together in a wheelbarrow or tractor bucket? Let us do the dirty work for you! Buy ingredients from us or bring your own. read more

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Raw Biochar
Amendments and Fertilizers

Biochar helps your soil sequester more carbon and emit less nitrous oxide. Also provides a dream home for beneficial bacteria and fungi, while preventing essential nutrients from leaching away. read more

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Soil Testing & Organic Fertilizer Recommendation Service
Amendments and Fertilizers

out-of-stock, Unavailable for Spring 2024
Don’t guess—test! You’ll learn your soil pH, organic matter percentage, levels of common minerals and nutrients, plus we’ll offer customized recommendations to correct or improve your soil read more

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North Country Organics® Bone Char
Animal-based - Amendments and Fertilizers

NPK: 0-16-0. Provides large amounts of readily available phosphorus. A most economical source of P for deficient soils. May be applied without restrictions to organically certified fields. read more

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20 Mule Team Borax Solubor® DF
Mineral - Amendments and Fertilizers

Soluble borate for fluid fertilizers and nutrient sprays. Boron is essential for all stages of tree growth and fruit set. Powder mixes easily in any spray solution. read more

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Allganic Potassium Sulfate of Potash Water Soluble 0-0-52
Mineral - Amendments and Fertilizers

NPK: 0-0-50. The most economical source of available potassium! read more

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Aragonite
Mineral - Amendments and Fertilizers

From oyster shells, not pulverized rock. Aragonite is even lower than calcitic lime in magnesium, so it's the ideal choice for soils with excessive magnesium. read more

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Azomite®, Field Grade Natural Trace Minerals
Amendments and Fertilizers

Contains over 67 minerals beneficial to plants and animals. A mix or particle sizes. Lots of powder, but still less dusty than Micronized Azomite. read more

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Azomite®, Granulated Natural Trace Minerals
Amendments and Fertilizers

Contains over 67 minerals beneficial to plants and animals, including rare earth elements. Very fine powder provides a quick release of nutrients. For slow-release longer-lasting applications. read more

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BrixBlend Basalt
Mineral - Amendments and Fertilizers

A paramagnetic stone powder for remineralizing and enhancing general foundational soil fertility. read more

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Fertoz Organic Granulated Rock Phosphate Fertilizer
Mineral - Amendments and Fertilizers

Natural phosphorus source. Adequate phosphorus results in more vigorous early root formation, better flower and seed production, better growth in cold temperatures, and better water use efficiency. read more

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Granite Meal
Mineral - Amendments and Fertilizers

Contains about 5% potassium in very slow-release form. Can be added to the soil in large amounts without altering the pH. Greatly enhances soil structure and promotes healthier plants. read more

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Gypsum, pelletized
Mineral - Amendments and Fertilizers

A good source of calcium when the soil pH is already at a desired level. read more

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Hum-Amend Max
Mineral - Amendments and Fertilizers

A powerful soil restoration amendment! Supports plant health and increases yields by facilitating roots’ uptake of plant nutrients and water. Improves levels of carbon and humus. read more

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K-Mag Granular Trio 0-0-22
Mineral - Amendments and Fertilizers

A good source of immediate potassium for depleted soil and of magnesium where calcium is abundant. Alliums like its sulfur and potatoes like its quick boost of potassium. read more

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Micronutrients Liquid Calcium
Mineral - Amendments and Fertilizers

Calcium helps strengthen plants’ cell walls, improving crop quality, disease resistance and storage capacity. Can help prevent problems like blossom end rot and bitter pit. read more

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Micronutrients Liquid Copper
Mineral - Amendments and Fertilizers

currently on backorder
Copper is necessary for efficient photosynthesis and respiration and affects the sugar content and flavor of produce. Contains 4% chelated copper derived from copper sulfate. read more

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Micronutrients Liquid Iron
Mineral - Amendments and Fertilizers

Iron is essential for chlorophyll development and function, and is also involved in nitrogen fixation by legumes. Contains 5% chelated iron derived from ferrous sulfate. read more

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Micronutrients Liquid Manganese
Mineral - Amendments and Fertilizers

low stock
Manganese helps plants to synthesize chlorophyll and is used in electron transport during photosynthesis. Contains 1% nitrogen from vegetable protein and 5% chelated manganese. read more

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Micronutrients Liquid Zinc
Mineral - Amendments and Fertilizers

low stock
Zinc is a component of auxin, an essential growth hormone, and is also necessary for proper root development. Improves cold tolerance. Contains 7% zinc derived from zinc sulfate. read more

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Monterey Epsom Salts
Mineral - Amendments and Fertilizers

Magnesium is a building block of chlorophyll and therefore essential to efficient photosynthesis. May boost yields significantly, especially for roses and tomatoes. read more

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Phosphate, Tennessee Brown Rock
Mineral - Amendments and Fertilizers

Recommended by soil gurus Phil Callahan and Mark Fulford. Lowest concentration of heavy metals of any phosphate source. Concentrations of available phosphate were regularly over 6% when tested. read more

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Pro Pelleted Calcitic Limestone
Mineral - Amendments and Fertilizers

The most common and most frequently used soil conditioner. also called Hi-Cal lime. Recommended for soils with excess magnesium. read more

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Pro Pelleted Limestone, Dolomitic Limestone Pro-Select Prill
Mineral - Amendments and Fertilizers

The least expensive liming agent. Use to sweeten soil (raise pH) and provide calcium where excess magnesium is not a problem. read more

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Tiger Organic 90CR Sulfur
Mineral - Amendments and Fertilizers

Agricultural Sulfur. Use to make soil pH more acidic. Often helpful for both lowbush and highbush blueberries, and for potatoes. Lowering the pH of gravel paths will help control weed growth. read more

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Wollastonite
Mineral - Amendments and Fertilizers

Silicon is linked to improved yields, especially recommended for cannabis, orchard crops, cucurbits, sweet corn, grains and forage crops. Also helps build resistance to powdery mildew. read more

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ZeoMax Garden Aid
Mineral - Amendments and Fertilizers

Zeolites can improve the productivity of any texture of soil, improving water and mineral retention in sandy soils and improving aeration and minimizing compaction in heavier soils. read more

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Ancients Rise Mix
Planting Mix - Amendments and Fertilizers

Formulated to build humus, enhance CEC, and condition the soil in which the ancient roots reside, whether they be abandoned heirlooms or wild seedlings. Can be applied in fall or spring. read more

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Blueberry Booster
Planting Mix - Amendments and Fertilizers

A blend of granite meal, K-Mag, sulfur, Tennessee brown rock, compost, peat, and Azomite. Brings down the soil pH and provides the nutrients necessary for healthy blueberry plants and good fruit. read more

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Fall Fruit Tree Prep Mix
Planting Mix - Amendments and Fertilizers

For a deluxe tree planting spot, choose this mix! Contains a broad spectrum of macro and micronutrients and soil conditioners that fruit trees thrive on. Follow our directions for use in the fall. read more

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Fruition Mix
Planting Mix - Amendments and Fertilizers

A balanced fertilizer to keep your bearing fruit trees healthy and productive. If your tree put on 4" or less of terminal growth last year, our Fruition Mix will put new spring in its step! read more

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Hole-Istic Spring Planting Mix
Amendments and Fertilizers

Recommended for fruit trees at planting time. Our own well-balanced blend of Tennessee brown phosphate, alfalfa meal, Azomite, and K-Mag in a humus-rich base of worm castings. read more

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Sleepytime Garden Blend
Planting Mix - Amendments and Fertilizers

Spread this this blend of granite, zeolites, gypsum, microminerals and humates in that fall, and it will improve soil structure, remineralize, and enhance nutrient availability for the next spring! read more

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Vegemighty
Planting Mix - Amendments and Fertilizers

NPK: 3.4-2.2-3.5. An excellent all-purpose fertilizer for those who prefer to avoid animal products. Great for flower bulbs because it won’t attract critters. read more

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