I just pour a dollop into a gallon of water (if I had to guess I'd say about 1 tbsp). From what I've read the carbs help boost bud production and there are loads of micro nutrients in it also. I only do two feedings of molasses in mid/late flowering, one about a week before flushing and as the last thing they get before the flush. If you use too much or use it too many time your soil will turn rock hard.