You are viewing all Organic Growers Supply products related to “Fertilizers.”
Coast of Maine Penobscot Blend™ Organic & Natural Planting Mix
currently on backorder
Compost and Potting Soil
currently on backorder
75% composted salmon, oyster-shell fragments, and wild blueberries with 25% sphagnum peat. Perfect for mulching trees and shrubs, or topdressing lawns. Adds nutrients and structure to planting mixes.
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Coast of Maine Quoddy Blend™ Organic Lobster Compost
currently on backorder
Compost and Potting Soil
currently on backorder
Soil conditioner for flower & vegetable gardens. Blend of compost, peat, aged bark and crab meal. Rich in micronutrients. Ideal for flower and vegetable beds.
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This top-quality compost has strong nitrogen levels and sky-high organic matter. Use as a top-dressing, mix into garden soil, or apply around the trees. Made in Sidney, Maine.
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Vermont Compost Plus®
currently on backorder
Vermont Compost Potting Mixes -
Compost and Potting Soil
currently on backorder
A great boost for transplants, potted plants and garden soils. Improves soil structure, provides a generous dose of slowly released nutrients and enhances microbial activity.
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NPK: 4-4-0.5. Contains fish hydrolysate, kelp extract, humic and fulvic acids, and a dash of chilean nitrate to boost the nitrogen levels for rapid vegetative growth
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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.
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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.
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Soil Testing & Organic Fertilizer Recommendation Service
out-of-stock, Unavailable for 2024
Soil Amendments and Fertilizers
out-of-stock, Unavailable for 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 impro
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NPK: 2-2-2. 16% Chitin. Nourishes chitin-feeding bacteria and fungi, which in turn devour gnat eggs and root-feeding nematodes. Also fortifies plants’ cell walls, and fosters healthy blooms.
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NPK: 0.5-0.5-0.3 apx, plus trace minerals. Worm castings limit plant disease and have beneficial effects including enhanced mycorrhizal activity and the suppression of parasitic nematodes.
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Biogreaux Crab Shell 4-4-0 18% Ca
currently on backorder
Animal-based -
Soil Amendments and Fertilizers
currently on backorder
NPK: 4-4-0 avg. 18% Ca avg. A macronutrient-rich byproduct of crab processing. Will help you grow massive specimens of field-grown cannabis. Improves lodging resistance and reduces branch breakage.
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NPK: 13-0-0. One of the fastest release times of all organic nitrogen sources. Highly recommended for corn. The smell (understandably) freaks out deer. Use as a side-dressing or till into soil.
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NPK: 13-0-0(apx). Provides a strong and quick release of nitrogen. Apply in the row at planting time for sweet corn, melons, brassicas and other heavy feeders. Not water-soluble.
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NPK: 6.9-11.9-0.8 avg. Excellent source of nitrogen and phosphorus. Use as a sidedressing or mix into compost to provide added nitrogen and a bacterial boost. A byproduct of wild-caught fish.
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NPK: 2-5-1. Fish heads, bones, skin and guts finely ground and then enzymatically digested. Can be used as foliar feed. Made from wild fish scraps from the fishing industry along the Great Lakes.
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NPK: 2-5-1. All the NPK of fish, along with the micronutrients and growth hormones of kelp. Encourages vigorous rooting. Improves plant vigor and stress resistance, increases storage life of produce.
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North Country Organics® Bone Char
currently on backorder
Animal-based -
Soil Amendments and Fertilizers
currently on backorder
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.
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NPK: 5-4-3 (with 9% Ca). Composted and processed poultry litter provides a good balance of major plant nutrients and other essential elements. Pasteurized to neutralize weed seeds and pathogens.
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The most common and most frequently used soil conditioner. also called Hi-Cal lime. Recommended for soils with excess magnesium.
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Pro Pelleted Limestone, Dolomitic Limestone Pro-Select Prill
Calcium Source -
Soil Amendments and Fertilizers
The least expensive liming agent. Use to sweeten soil (raise pH) and provide calcium where excess magnesium is not a problem.
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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.
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NPK: 3-3.5-3.5 avg. plus sulfur. With 3G Greener Garlic Grower, you can expect better spring emergence, more vigorous plants, bigger bulbs and richer flavor. Blended in-house.
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5G Grow Great Garlic Greener, Guaranteed Kit
Fedco's Fertilizer Mixes -
Soil Amendments and Fertilizers
Kit includes user-friendly instructions and supplies for up to 100 cloves (about 2 lb) of seed garlic!
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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.
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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.
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This fertilizer and amendment mix includes all the goods contained in our well-loved CannaLot MegaSoil, minus the compost and potting soil. Great for plants grown in the ground, and cheaper to ship!
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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.
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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!
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NPK: 2-5-7. Our new house mix will help you grow mighty spears of asparagus. Formulated to meet Penn State Extension’s recommendations for the annual fertilization of asparagus beds.
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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.
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Spread this blend of granite, zeolites, gypsum, micronutrients and humates in that fall, and it will improve soil structure, remineralize, and enhance nutrient availability for the next spring!
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NPK: 3-4-6.1 By popular demand! A Fedco Blend formulated to meet the needs of field-grown (outdoor) fruiting Solanaceous crops: tomatoes, peppers, eggplants and tomatillos.
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NPK: 2.5-6-3. Show your flowers you appreciate them by treating them to dinner now and then. This mix is formulated to feed both soil and plant to encourage healthy foliage and lush, colorful blooms.
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NPK: 7-2-9 avg. 2% Ca and 3.5% S. High-test organic fertilizer, formulated to meet the nutrient requirements of potatoes. Blended in-house.
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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.
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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.
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Contains over 67 minerals beneficial to plants and animals. A mix or particle sizes. Lots of powder, but still less dusty than Micronized Azomite.
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Contains over 67 minerals beneficial to plants and animals, including rare earth elements.
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A paramagnetic stone powder for remineralizing and enhancing general foundational soil fertility.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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Manganese helps plants to synthesize chlorophyll and is used in electron transport during photosynthesis. Contains 1% nitrogen from vegetable protein and 5% chelated manganese.
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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.
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Magnesium is a building block of chlorophyll and therefore essential to efficient photosynthesis. May boost yields significantly, especially for roses and tomatoes.
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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.
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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.
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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.
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NPK: 4.6-0.9-1.3 avg. A favorite of earthworms and other beneficial soil organisms, and inhibits the growth of some notorious pathogenic soil microbes. Beloved by hemp and cannabis growers.
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NPK: 6-1-3 avg. Rich in the basic nutrients, nitrogen, phosphorus and potassium, it makes an excellent fertilizer and soil additive. Can help suppress fusarium infestations.
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NPK: 2.5-0.4-3.3 avg. Gives plants a noticeable boost and feeds soil organisms. Excellent vegan alternative to blood meal as a nitrogen source. Hands-down the best-smelling fertilizer out there.
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Molasses is a source of important nutrients, including manganese, magnesium, copper, potassium and calcium. Food grade, shelf stable. Plants and beneficial microbes have a sweet tooth, too!
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New formula is twice as concentrated as the liquid kelp we carried for years, so you'll need only half as much!
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For soil: excellent source of naturally chelated elements, enzymes, and amino acids. For livestock: excellent source of iodine, vitamin A and dozens of other vitamins and trace minerals.
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NPK: 0-0-18. Highly concentrated extract makes an excellent foliar spray containing growth hormones, trace minerals, enzymes and carbohydrates.
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NPK: 7-1.5-1 avg. Effective and economical nitrogen fertilizer for Northeast soils. High levels of nitrogen and potassium are released as soybean meal breaks down, providing fertility over time.
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