I MUST STRESS, DO THIS ONLY IF YOU ARE GROWING IN SOIL. APPARENTLY MOLASSES MESSES UP PLANTS IN HYDRO SET UPS..
you have to use unsulfrated molasses. i believe the quantity is 1 tsp/gallon of water. do that every watering for the last 3-4 weeks or so of flowering. better to do it late than never. if i remember right, i read that adding sugar (molasses) during flowering increases the bud size and weight approximately 33%