Infopirate.org

How can you be sure that the compost or mulch that you buy in the garden store is really organic. Why should you even care? It's simple really. If you grow vegetables in soil, whatever is in the soil can end up in the plant and in the fruit or vegetables through the plant's vascular system. Many dangerous pesticides, chemicals and heavy metals are soluble in water and can end up in your food.

http://hubpages.com/hub/Beware-Of-Contaminated-Organ...