Plant Health Care (PHC) is defined as a holistic approach to maintaining the health and vitality of plants, such as trees, shrubs, perennials and turf grass. While trees are dominant features in landscaping, they share this area with turf grass, shrubs, and perennials. All these plants have one resource in common: the soil. The roots of trees, shrubs, turf grass, and perennials intermingle and compete for water and nutrients. The care of each plant in a landscape can affect the health of the landscape as a whole.