Premium Montmorillonite Calcium Bentonite

Rocky Mountain BioAg® Premium Montmorillonite | Calcium Bentonite | RMBA

Regular price$16.95
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The makeup of soil is arguably the most important part of having a successful growing experience. Soil must have the perfect balance of moisture and nutrients in order to successfully nurture plant life. This can be a delicate system to manage, but Rocky Mountain BioAg® Premium Montmorillonite Calcium Bentonite is one more tool in your kit to obtain the healthiest soil possible.

The wettability of soil, or its ability to hold water, is extremely important for proper growth. Montmorillonite calcium bentonite is one of the ways to improve wettability by offering a complex nutrient blend to ensure your soil is as healthy as possible. Our Montmorillonite is sourced from only the best deposits the country has to offer, so it’s all-natural, never synthetic, and the highest quality available.

Not only does this blend provide exceptional nutrients and improve wettability, but it prevents leaching of other nutrients and helps plants absorb them more easily. To improve soil structure and health, look no further than Rocky Mountain BioAg® Premium Montmorillonite Calcium Bentonite. 


  • Improves soil wettability
  • Increases CEC (cation exchange capacity) of soils
  • Prevents nutrient leaching
  • Supplies calcium, magnesium, and potassium
  • Improves soil structure
  • Available from 3.75 pound quantities to 2000 pound quantities

    Product Application Instructions and Rates

    • 1 Cup = Approximately ¾ Pound •

    Bulk Applications:
    Apply 500 – 1000 lbs. per acre every other year. Excelerite is most efficient if incorporated into the soil immediately after application 2” – 4”.

    Fertilizer / Compost Additive:
    Add 2% and no more than 5% of the total amount of compost or fertilizer used. Mix thoroughly with compost or fertilizer and apply as usual. When adding to compost or fertilizer take into account the increased efficiency of your compost and fertilizer when adding Excelerite. 

    Established Turf Grass:
    Apply as a top dressing for fairways, rough, lawns, greens, landscapes, or on any established grass. Apply 25 lbs. of minerals per 1,000 square feet in the spring.

    Starter or Grow-Ins:
    Apply 25 lbs. of minerals per 1,000 sq. ft. Till or rake into the top 2” – 4” after surface spreading.

    Ornamentals and Raised Beds:
    Apply 1 lb. (Approximately 1 1/3 cups) per 40 sq. ft. Work into the soil 2” – 4” prior to placing flowers or ornamentals. Repeat application in the spring.

    Up to Two Gallon ¼ cup, Five Gallon ¾ cup, Fifteen Gallon 2 ¼ cups, 24" Root Ball 4 ½ cups, 36" Root Ball 6 ¾ cups, 48” Root Ball 9 cups.

    Base Potting Soil:
    Mix 1-2 Cups (.75 – 1.5 lbs.) per cubic foot base potting soil.

    1 Teaspoon per inch of pot size. Apply as often as necessary.

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    Biological... Beyond Organic®

    Organic is just the start

    RMBA is committed to provide natural and organic products that support healthy soils. Even if a product is not listed as 'organic' you can rest assured that it will help, not hurt your soil.

    Don't take our word for it


    This has been the best pumice i have ever used!!! Besides the great customer service (*****)

    Ricardo S

    McAllen, TX


    Rocky Mountain BioAg has the best customer service! Prompt delivery and product support. Thanks !

    Joe B

    South Kingstown, RI


    I have a greenhouse that unfortunately does not get the ideal sunlight due to its location on the north side of my home. I have been using Rocky Mountain BioAg’s Quantum Growth Organic Total for over a year and have seen a dramatic increase in plant growth and vegetable yield compared to past years. Highly recommend the product.

    Jack C

    Sarasota, FL


    Excellent customer service, quick response, fast turnover and shipment of merchandise and product was exactly what was described on website and what I wanted. Great Company!

    Jessica S

    Harrisonburg, VA