Used correctly, the term cleaning refers to the removal or killing of over topping competitors that are significantly taller than the desired trees, and is usually done in the sapling stage. While the term weeding refers to the removal of mainly herbaceous plants and shrubs that are of the same height, but still competing for the resources that could be used by the selected trees.It is usually done in the seedling stage.[2]Or cleaning is carried out in a crop which has not crossed the sapling stage and it is defined as the cutting made in order to face the best individual form undesirable one of the same age which interfere or likely with the growth of the desired individuals