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A branch of horticulture concerned with the selection, planting, and care of woody perennial plants. Knowing the potential form and size of plants is essential to effective landscape planning as well as to the care needed for plants. Arborists are concerned primarily with trees since they become large, are long-lived, and dominate landscapes both visually and functionally.
Plants can provide privacy, define space, and progressively reveal vistas; they can be used to reduce glare, direct traffic, reduce soil erosion, filter air, and attenuate noise; and they can be positioned so as to modify the intensity and direction of wind. They also influence the microclimate by evaporative cooling and interception of the Sun's rays, as well as by reflection and reradiation. Certain plants, however, can cause human irritations with their pollen, leaf pubescence, toxic sap, and strong fragrances from flowers and fruit. Additionally, trees can be dangerous and costly: branches can fall, and roots can clog sewers and break paving. See also Landscape architecture.
The art of growing and cultivating ornamental trees.

Arboriculture (
/ˈɑrbərɨkʌltʃər/) is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants. It is both a practice and a science.
The science of arboriculture studies how these plants grow and respond to cultural practices and to their environment. The practice of arboriculture includes cultural techniques such as selection, planting, training, fertilization, pest and pathogen control, pruning, shaping, and removal.
A person who practises or studies arboriculture can be termed an 'arborist', an 'arboriculturist' or a 'tree surgeon'.
Risk management, legal issues, and aesthetic considerations have come to play prominent roles in the practice of arboriculture.
Arboriculture is primarily focused on individual woody plants and trees maintained for permanent landscape and amenity purposes, usually in gardens, parks or other populated settings, by arborists, for the enjoyment, protection, and benefit of human beings. It is therefore related to, but distinct from agriculture, horticulture, urban forestry, forestry, dendrology, and silviculture.
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