Healthy plants begin with healthy soils. Fertilization is just the start. Adjusting soil pH and ensuring adequate organic matter is present are also key to healthy soils. For plants in urban and suburban soils, Bartlett Tree Experts can simulate the optimal conditions for growth found in nature. In fact, their patented Root Invigoration Process combines all the above into a single treatment to achieve this goal. Bartlett offers the most intensive soil management programs in the landscape industry.  This certificate will entitle you to a one-hour visit and soil analysis, then a treatment of slow fertilization via deep root injection to help improve health and vigor.  Bartlett Arborists submit more than 10,000 soil samples from client properties each year, which provides information for developing fertilizers for specific geographic areas.  More info at http://www.bartlett.com/fertilization.cfm?rs