What tool is primarily used for trimming hedges and bushes?

The tool primarily used for trimming hedges and bushes is the hedge trimmer. Hedge trimmers are specifically designed to cut back and shape shrubbery, allowing for precise control over the plant's growth and appearance. They are equipped with long blades that can easily navigate through dense foliage and reach areas that would be challenging with other tools.

Lawn mowers, while effective for cutting grass, are not suitable for managing the branches and leaves of hedges. Chainsaws are intended for cutting down larger trees and limbs and are not practical or safe for the subtle work involved in hedge trimming. Leaf blowers serve a different purpose entirely, as they are designed to clear leaves and debris rather than trim plants. Hence, the hedge trimmer is the appropriate choice for this task.