Hye blunt, I did think I noticed some results from using it during veg, although a lot of ppl will probably point out that it was negligible. To be honest you'd be better of with hydro or aero, but if growing in soil (which I prefer) you have to remember the old saying: 'Feed the soil!' That means feed the micro-organism's, which require carbohydrates. There is a complicated symbiotic relationship between the various micro-organism's and the plant. basically, the bacteria and fungus in the soil feed the roots, in return the plant gives them energy. I would like to experiment with 1 pot using sugar/molasses, and 1 without. Unless you have everything else perfect, I wouldn't bother, concentrate on the more important things. Having said that, it doesn't hurt so why not.