thinning

Thinning in horticulture is the practice of removing flowers or young fruit from a plant. This is done to allow the remaining fruits to grow larger and to prevent the plant from producing an excessive crop, which could hinder its ability to flower and set fruit the following year.1

Thinning can be accomplished manually, mechanically, or chemically. For example, in date cultivation, the flower clusters are reduced during hand-pollination. Certain grape varieties have entire clusters removed, while others benefit from growth-regulating sprays. For fruits like peaches and apples, branches may be struck with a padded pole, or mechanical shakers can be used. Increasingly, chemical sprays are employed as a substitute for hand thinning, using either caustic sprays during bloom or growth-regulating substances after bloom.1

Pruning, a related practice, involves the removal of plant parts to influence growth and fruitfulness, focusing on shaping the plant in its early years and then on maintenance for efficient spraying, harvesting, light exposure, and a balance between flowering and leaf surface.23