We use a time release liquid fertilizer soil drench that will break down in the soil throughout the root zone and is active for one full season.
All plants have nutrient requirements. In a landscape setting, these nutrients get used up, are missing, or are unavailable to the plants. In an urban landscape there are usually many plants, including grass or groundcovers, surrounding trees and shrubs. This creates greater competition for what nutrients are in the soil already. Adding fertilizers gives the soil more nutrients, decreasing competition, and therefore stress. Fertilization promotes healthy, vigorous plants that display good growth and color.
Healthy plants increase the plants resistance to insects and disease. A misconception is a belief that lawn fertilizers will fertilize your trees. In reality, very little of those nutrients make it below the depth of the shallow roots of the grass to the deeper roots of trees and shrubs.