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Organic Soil Amendments List

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Sup\'r Green (3-2-2)
Prices start at : 5.26 USD / 25.00 lbs

Benefits: • Approved for organic use (NOP) • Over 5 times more plant food value than steer manure • Guaranteed weed and dirt free • Ground for uniform texture • Special slow release makes it last and last • Really makes your vegetables, flowers...
  • brand: Stutzman Farms
Montana
Bozeman
Bone Meal (2-14-0)
Prices start at : 45.15 USD / 55.0 lbs

CAUTION: Do NOT feed to cattle or other ruminants. For individual bulbs, add 1 tsp into the prepared hole and mix with loose dirt. Great for fruits, flowers and bulbs! This product is compliant with the USDA National Organic Program (NOP) .
  • brand: Bridgewell Resources
Montana
Bozeman
Azomite (0-0-0.2)
Prices start at : 17.35 USD / 50.00 lbs

Assays reveal that the material contains a broad spectrum of active minerals and trace elements. OMRI Listed for use in organic production. A natural source of minerals and trace elements! Micronized Azomite is used in gardens as a re-mineralizer for...
  • brand: Azomite Mineral Products
Montana
Bozeman
Sphagnum Peat Moss
Prices start at : 11.45 USD / 50.0 lbs

Contains a unique cell structure that helps regulate moisture and air around plant roots creating an ideal growing environment. Use 1 part peat for every 2 parts soil in the back-fill mix.
  • brand: Black Gold
Montana
Bozeman
Fish Bone Meal (4-20-0)
Prices start at : 40.2 USD / 55.0 lbs

For new plantings, prepare the transplant hole and mix 1-2 cups with the backfill soil. Trees & Shrubs: Spread 1 cup for every inch of trunk diameter within the drip line. For established plants, side dress 2-4 oz every month during the growing season.
  • brand: Pro-Pell-It!
Montana
Bozeman
Alfalfa Pellets
Prices start at : 16.25 USD / 55.0 lbs

Made in Montana. Used as an animal feed, Alfalfa Pellets are an excellent nitrogen source (up to 5%). Benefits: • Pelleted for easy application • An excellent source of nitrogen from a plant source • Contains triacontanol a natural plant growth...
  • brand: Payback
Montana
Bozeman
Kelp Meal (1-0-2)
Prices start at : 78.35 USD / 55.0 lbs

Excellent as a trace mineral supplement for animals too! OMRI Listed for use in organic production. Contains over 60 naturally-chelated minerals and essential elements that the fast-growing sea plant absorbs from the cold, nutrient-rich waters of the...
  • brand: Tidal Organics
Montana
Bozeman
Humic Acids (Granular)
Prices start at : 4.39 USD / 6.00 lbs

Down to Earth Granular Humic Acid Fertilizer is harvested from a huge deposit of compressed and decomposed plant life from millions of years ago. Lawns: In spring and fall, apply 1-2 lbs per 100 square feet and water well.
  • brand: Down To Earth
Montana
Bozeman
Kelp Meal (1-0.5-2)
Prices start at : 5.15 USD / 3.00 lbs

Mix thoroughly for maximum results. Established Plants: Side dress with 1/4 cup for every 10 square feet of growing area, or work 1/4 cup for every inch of trunk diameter into the soil within the drip line.
  • brand: Dr. Earth
Montana
Bozeman
Soybean Meal (7-1-2)
Prices start at : 8.12 USD / 6.00 lbs

Benefits: • All organic, GMO-free ingredients • Processed to retain maximum nutrient value • Slow-release formula lasts throughout the season • 7-1-2 NPK ratio Available in 5-lb container.
  • brand: Down To Earth
Montana
Bozeman
Rock Phosphate
Prices start at : 23.5 USD / 55.0 lbs

OMRI Listed for use in organic production. Since phosphorus is lacking in most soils, fertilizer applications are a must for superior results. An organic, untreated Soft Rock Phosphate (0-3-0) with colloidal clay containing valuable trace minerals in...
  • brand: Canton Mills
Montana
Bozeman
Neem Meal (6-1-2)
Prices start at : 8.01 USD / 6.00 lbs

After oil is extracted from seeds of Azadirachta indica the remaining material can be processed and turned into a soil amendment that protects plants against diseases while improving soil nutrients.
  • brand: Down To Earth
Montana
Bozeman
Greensand (0-0-0.1)
Prices start at : 9.65 USD / 8.50 lbs

Supplies potassium, an essential nutrient that promotes overall plant hardiness and disease resistance, along with iron, magnesium, silica and as many as 30 other trace minerals. Light: 5 to 10 lbs.
  • brand: Espoma
Montana
Bozeman
Vermiculite (8qt)
Prices start at : 2.46 USD / 3.00 lbs

Preferred by many hydroponic operations as a sterile seed-starting grow medium. To amend problem soil, combine with equal amount of soil for optimal water retention and air availability.
  • brand: Black Gold
Montana
Bozeman
Karanja Cake (55lb)
Prices start at : 65.3 USD / 65 lbs

Often combined with neem for dramatic results. If using an air pump, bubble for 36-48 hours prior to application. Containers: Add 1 cup per 5-gallons of soil or soilless media. Ideal for garden soils and potting mixes! Organic Karanja Cake ( Pongamia...
  • brand: Concentrates
Montana
Bozeman
Basalt Powder
Prices start at : 21.7 USD / 55.0 lbs

Benefits: • High in calcium, iron, magnesium and manganese • Increases the cation exchange capacity of soils • Higher brix levels and greater concentrations of essential oils • May be used on crops, home gardens, landscapes and turf • Improve...
  • brand: Gaia Green
Montana
Bozeman
Greensand (0-0-0.2)
Prices start at : 32.8 USD / 50.0 lbs

OMRI Listed for use in organic production. Used as a soil amendment and fertilizer, Micronized Super Greensand contains about 10% total potash (0.2% soluble), along with iron, magnesium, silica and as many as 60 other slow-release trace minerals.
Montana
Bozeman
Dried Blood (13-0-0)
Prices start at : 56.15 USD / 45.0 lbs

Great for heavy feeders, like spinach, corn and salad greens. May also be used in gardens to repel deer, or used as a compost starter to heat up cool piles. Features: • A powerful source of organic nitrogen (13%) • Slow release — feeds plants over...
  • brand: Pro-Pell-It!
Montana
Bozeman
Neem Cake
Prices start at : 36.95 USD / 50.0 lbs

Benefits: • Promotes a rich, dark green leaf color • Protects plant roots and enhances growth • Encourages beneficial organisms — earthworms love it! • A favorite for vegan gardening! • Will not burn plants Available size: 44 lb Bag DIRECTIONS...
  • brand: Concentrates
Montana
Bozeman
Gypsum
Prices start at : 14.2 USD / 55.0 lbs

Will also improve the structure of alkaline soils by removing excess sodium. 22% Sulfur (S) ….. Apply in spring and fall to take advantage of seasonal moisture. 50% Calcium Sulfate Dihydrate (CaSO4 – 2H2O) …..
  • brand: Columbia River Carbonates
Montana
Bozeman
Fossil Shell Flour
Prices start at : 25.9 USD / 57.0 lbs

Diatomaceous earth is a gardener's best friend. Safe and effective — contains less than one half of 1% crystalline silica and is “generally regarded as safe.” Benefits • Food grade — OMRI certified for use with grain, seed, livestock operations...
  • brand: Perma-Guard
Montana
Bozeman
Cottonseed Meal
Prices start at : 30.9 USD / 55.0 lbs

Benefits: • Ideal for blueberries, gardenia, azalea and rhododendron • Slow release source of nutrients from a plant source • High in trace elements • Will NOT burn plants • Derived from shelled cotton seeds Available size: 50 lb Bag DIRECTIONS...
  • brand: Pro-Pell-It!
Montana
Bozeman
Garden Manure (4-2-2)
Prices start at : 3.44 USD / 5.00 lbs

Espoma Garden Manure (4-2-2) feeds plants slowly and safely. Containers: Potting Mix – Use one part to twenty parts soil. Approved for organic gardening. Work into the top 4-5 inches of soil.
  • brand: Espoma
Montana
Bozeman
Greensand
Prices start at : 6.14 USD / 8.00 lbs

Benefits: • Contains iron, magnesium, silica and as many as 30 other trace minerals • Promotes overall plant hardiness and disease resistance • Loosens heavy clay soils • Improves the moisture holding capacity of soils • A 100% natural source...
  • brand: Down To Earth
Montana
Bozeman
Silica (Si)
Prices start at : 8.5 USD / 2.00 lbs

OMRI Listed for use in organic production. Montana Grow Si is an organic silica plant amendment. These ingredients are crucial to building strong roots, foliage and stems. Features: • Builds strong roots, stems and foliage • A naturally produced and...
  • brand: MontanaGrow
Montana
Bozeman
Glacial Rock Dust
Prices start at : 21.5 USD / 55.0 lbs

Benefits: • Contains a full range of minerals and trace elements • Will improve the quality of your garden soil • Earthworms and beneficial soil microbes love it! • Increases crop vitality and yields • Improves the nutritional value of vegetables...
  • brand: Gaia Green
Montana
Bozeman
Fish Meal (9-4.5-0)
Prices start at : 68.55 USD / 55.0 lbs

Benefits: • A strong source of nitrogen (9%) • Slow release — feeds plants over a period of time • Low temperature processed to preserve plant nutrients • Promotes vigorous growth during all stages of plant development • Heavy feeders like...
  • brand: Pro-Pell-It!
Montana
Bozeman