Bagged soils can contain herbicides, gnats, and other unsavory problems.
Stories about compost possibly contaminated with heavy metals from sewage waste and disastrous herbicides turning up in potting soil aren’t new. In 2010, the University of Maryland Extension put out a “Gardener’s Alert! Beware of Herbicide-Contaminated Compost and Manure.” The Ohio State University Extension put out a fact sheet on one persistent pesticide showing up in compost that kills off tomato, eggplant and other nightshade family vegetables as well as beans and sunflower.
But it seems more recently that gardeners are starting to pay attention to other problems that come with mass-produced, commercial potting soils and compost: the importation of pests and disease into your garden or indoor grow space. (more…)