STA Certified

Our Grow Green Compost is now STA Certified.


The US Composting Council’s Seal of Testing Assurance Program (‘STA’) is a compost testing, labeling and information disclosure program designed to give you the information you need to get the maximum benefit from the use of compost.
Our compost is tested every 3 months and analyzed for the following properties:

soluble salts
nutrient content (total N, P2O5, K2O, Ca, Mg)
moisture content
organic matter content
bioassay (maturity)
stability (respirometry)
particle size (report only)
pathogen (Fecal Coliform or Salmonella)
trace metals (Part 503 regulated metals)