This program enhances the nutrients in your trees & shrubs to improve their overall health. The result is fuller foliage and more vibrant blossoms. Trees require nutrients to live and thrive. When one or more of these nutrients are deficient in the soil, the tree will not reach its full landscape potential, will be more susceptible to disease and insect problems, and will have a shorter life than a similar, well-fertilized tree. Essential elements for plant nutrition include nitrogen, phosphorus, potassium, calcium, zinc, copper, molybdenum, magnesium, iron, sulfur, manganese and boron. They come from the soil and from applied fertilizer. Plants obtain carbon, hydrogen and oxygen from the air or through the soil. Certain elements--such as boron, zinc, manganese, iron, copper and molybdenum--are called micronutrients, because plants require very small amounts of them. However, they are just as essential for plant growth as the macronutrients - nitrogen, phosphorus and potassium--which are required in larger amounts.