Some species of trees and shrubs can grow very fast and to impressive sizes. When growing quickly, many species develop relatively weak wood that can more easily fail during storm events. Aside from safety concerns, other issues for fast-growing species include the obstruction of views or walkways, or growing on or close to structures such as houses and buildings. Matters such as these are handled by pruning, which allows arborists to direct growth and reduce size in a relatively precise manner. Pruning is a dynamic process, which requires multiple visits over the lifetime of the tree or shrub. Products called tree growth regulators can reduce tree growth and may be a good option to reduce the need for frequent pruning for some species. The products work by inhibiting the production of growth hormones in the plant, and the result is, aside from reduced growth, often greener leaves and denser flowering.
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