Like jord said there isint some magical foliar spray thats going to blow people out of the water, but there is a product ive seen secondhand that im going to use next time called "nitrozyme"...you only use it once a week at night in the veggie state(not until 2nd week) and the comparison results to a plant w/o it are undeniable...(just looks bushier and healthier, really promotes side growth)...
Im not saying to go out and buy it, just look into it for yourself...