Big Rootz Potting Soil by The Soil King
Big Roots Microbe Friendly Soil by The Soil King in 1.5 Cu. Feet Bag
Big Rootz Potting Soil by The Soil King in 40 Cubic Foot Bag
Big Rootz Soil by The Soil King Information Sheet

Big Rootz By The Soil King | Designed By Growers For Growers | RMBA

Regular price$29.95
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Grow the biggest, strongest plants by focusing on the health of your roots with Big Rootz® by Soil King Garden Center. This all-purpose potting soil is formulated for professional agriculture but is perfect for anyone looking to grow their plants healthy and robust. 

With over 20 years of research, Big Rootz® was created by Patrick King, owner of Soil King Garden Center. Patrick went above and beyond to develop a soil that was created by gardeners for gardeners. Big Rootz® features the addition of the purest amendments that you need, as well as mycorrhizae, and is exceedingly microbe-friendly.

In order to grow successful plants, you need to create a solid foundation. Sub-par potting soils don't include the nutrients your plants need to thrive, which can leave you dealing with pests, rot, and nutrient deficiencies.

Big Rootz undergoes rigorous quality assurance testing, including only sourcing natural and organic ingredients and materials. The soil is also tested for pesticides, heavy metals, and GMOs, ensuring that it aligns with the Rocky Mountain BioAg® promise of providing biological products that are Biological… Beyond Organic. 


  • The product of over 20 years of research and refinement
  • Designed By Growers for Growers
  • Blended in the USA
  • Pure ingredients and tested for pesticides, heavy metals, and GMOs
  • Contains mycorrhizae
  • Microbe friendly

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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