swells the bud out, its a carbohydrate also its got some micro nutes in it i believe that are supposed to help the soil, also like madcatter states it mellows the smoke, like putting raw moonshine style whiskey in a port wine cask in order for it to absorb the flavour of the port and reduce the harshness. thers a few plant foods out on the market that actually have molasses in with the mix, i'm not sure but i think my own stuff, biobizz biogrow has some in it, its as thick and sticky as a motherfucker, horrible stuff to work with, u gotta keep it warm or it turns to glue, i had to put some boiling water in with mine today coz it wouldnt pour out the feckin bottle.