Yo FUM. Molasses is commonly used as bloom stimulant in the flowering cycle of a plant. It contains an array of micronutrients and is high in sugar which allegedly helps marijuana produce "fatter buds". However I have used during vegetative growth as well and the plants have responded very well. Molasses is high in potassium and can be applied if you suspect a deficiency in potassium
Read this... hxxp://www.onlinepot.org/grow/3lbsMolassesManual.htm
It will give you all the info you need.