The urban & suburban soil in northeast Illinois are lacking many of the key nutrients trees & shrubs need to grow healthy and strong, so they can fight off diseases, pests, and other stressors. By giving your trees & shrubs the nutrients they need, your plants can build up their reserves and better handle stressors like drought, over saturation of soil due to heavy rains or flooding, construction in the root zones, air pollution, urban environment, and storm damage.