The objective of this work is to describe the potential uses and agroecological benefits of the weed associated to the tomato agroecosystem. 58 dicotyledonous species belonging to 22 families were identified. Samples were collected in 10 industrial tomato plots sited in Tres Quebradas, La Limona, La Colorada, San Luis, La Balita, La Espigadilla, La Lomita and La Honda that belongs to the district of Los Santos, province of Los Santos. The results show that 30 (26%) supporting species fixed nitrogen, give forage or feed; 45 (39%) species provisioning food, water, fiber and fuel; 31 (27%) species regulate the crop microclimate and diseases and 9 (8%) species provide cultural services like ornamentals. The species with the higher relative and absolute frequency were Rynchosia minima and Calopogonium mucunoides (Fabaceae). This paper presents a description of the benefits of weeds, their uses and importance in maintaining the agroecosystems functions.