Since this is your first time, I think the other guy had a good idea, which is to give it to one or two of your plants only and compare the results. It might save you a lot of money in the future, and if your plants don't like it, it might save your harvest too! A lot of people have ditched bloom boosters either because they didn't make much difference or because it changed the taste of the bud. Just be careful, that stuff is strong!