Yes! The chemical Clopyralid is a weed-killing chemical that does not break down well during composting, unlike most other herbicides and pesticides. It is found in herbicides used by professional lawn care companies and in agriculture. It is not found in lawn and garden products for home use. According to the EPA, Clopyralid is not harmful to people or animals at low levels found in compost products. The problem, however, is that Clopyralid tainted compost has been found to damage some non-target plants. Especially vulnerable are tomatoes, peas, beans, potatoes and sunflowers, as well as some landscape plants. Damage to non-target plants result in abnormal growth and may prevent fruit set. Clopyralid is damaging to sensitive crops at concentrations as low as 10 ppb or less.

Soil Building Systems composts and soil mixes are free of Clopyralid. SBS conducts periodic lab tests for the detection of Clopyralid. The test results show SBS composts to have no (zero) trace elements of Clopyralid.