The effect of the addition of bulking agents (BA) to horticultural waste during aerobic degradation was studied. The mixture was composed of six organic wastes generated in great quantities in the Central Market of Mexico City; they were tomato, pineapple, banana, lettuce, orange and papaya fruit. These organic materials have a high content of moisture; therefore, it is necessary to add BA in order to improve their properties during aerobic composting or biodrying processes. The BA used were: a) wood shavings, b) yard waste and c) a mixture of compost with wood shavings. During the degradation process, the generation and pH of leachate, as well as temperature, moisture content and mass reduction of solid waste was measured. The results showed that the moisture content in horticultural waste can be regulated with dry bulking agents that absorb some of the leachate during the first weeks of the process, while improving pile structure thus avoiding anaerobic degradation. The best results were obtained from the treatment consisting of a mixture of compost and wood shavings as BA, which had a reduction in leachate generation of 64.6 % compared with the control sample. The reduction in dry mass basis, related to the initial total mass, averaged 89 % in all trials.