Fertilizers - Supplies

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Single Ingredient Nitrogen

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. read more

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Biogreaux Crab Shell 4-4-0 18% Ca

Single Ingredient Nitrogen

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. read more

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Blood Meal

Single Ingredient Nitrogen

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. read more

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Feather Meal

Single Ingredient Nitrogen

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. read more

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North Country Organics® Bone Char

Single Ingredient Nitrogen

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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Poultry Manure Compost

Single Ingredient Nitrogen

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. read more

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Soybean Meal

Single Ingredient Nitrogen

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. read more

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Fertoz Organic Granulated Rock Phosphate Fertilizer

Single Ingredient Phosphorus

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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Fish Bone Meal

Single Ingredient Phosphorus

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. read more

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Tennessee Brown Rock Phosphate

Single Ingredient Phosphorus

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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K-Mag Granular Trio 0-0-22

Single Ingredient Potassium

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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Sulfate of Potash 0-0-50

Single Ingredient Potassium

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

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Superworm Frass

Worm Castings and Frass

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. read more

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Worm Castings

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. read more

Organic Growers Supply: Fertilizers