FERTILIZING Tree and shrub fertilization is an essential component of the Plant Health Care regime which we recommend. Fertilizing improves plant vigor and insect & disease resistance while fostering growth. In the urban environment, trees often suffer from some nutrient deficiency due to competition with turf and other plants. They do not benefit from the natural process of nutrient replenishment through decomposition of organic matter that occurs in the forests. Poor leaf color and slow growth are often symptoms of nutrient deficiencies and the weakened plant may become more susceptible to insect and disease damage. Our staff is well trained in detecting impending problems and recommending the optimum time, method and type of fertilizer needed for each individual plant. This is an essential aspect of preventive tree care.