I have been using a mix very much like this for decades. I use it to fill in dead areas (around trees, shrubs, extreme bright areas, etc.) it almost triples the growth or spread rate of grass, and other such plants. I mix it for whole yard application like follows: 1 cup Beer; 1 cup Dawn Dish soap; 1 cup household ammonia in a 1 gallon jug. then pour into sprayer. I assume it would be done as Hardon stated mix wise, for this type of grow. Never tried on MJ but it is a fertilizer of sorts and seems to stimulate root growth.