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Fertilization

Fertilization is another important aspect of tree health care. Fertilizer is best applied in the fall or early spring, although it is not harmful to apply fertilizer at any time during the year. In addition to providing minor nutrients, fertilizers increase the amount of three major nutrients in the soil: nitrogen, phosphorous, and potassium. Nitrogen (N) is possibly the most critical of these nutrients. It is the element most responsible for maintaining the green color in leaves and for normal twig growth. Because nitrogen is rapidly depleted from the soil, it must be replenished regularly to ensure plant health.

Phosphorous (P) assists in the maturation of tissues and stimulates root growth. It is particularly important in flower, fruit, and seed production. Fortunately, phosphorous in the soil is not depleted as rapidly as nitrogen, yet lack of sufficient phosphorous may limit the number of plants that can thrive in a particular area.

Potassium (K - also known as potash) assists in the manufacture of sugar and starches, helps tissues mature properly, and heightens the color of flowers. Plants without enough potassium may become either too succulent or too brittle.

Various fertilizer mixtures contain different amounts of these and other nutrients. Soil conditions, especially pH and organic matter content, vary greatly from region to region, thus the proper selection and use of fertilizer is a complex process. When applying fertilizer remember that nitrogen can be applied directly on the soil surface, whereas phosphorous and potassium, like other insoluble nutrients, should be applied via holes in the soil. Collins Tree Service has the knowledge and equipment to provide the proper fertilizer to your valuable trees and shrubs.