Fertilizing Landscape Trees and Shrubs

Tree and shrub fertilization is especially important in urban and suburban areas of Virginia where soils have been altered due to construction. These urban soils tend to be heavily compacted, poorly aerated, poorly drained, and low in organic matter. Even where soils have not been affected, fertilization may be needed as part of a maintenance program to increase plant vigor or to improve root or top growth.

The link address is: http://www.ext.vt.edu/pubs/nursery/430-018/430-018.html