I have to say a lot of the info in this book seems out of date when compared to current theory and practise on growing, at least as far as the stuff on the net on indoor growing is concerned. The book tends to assume you will grow one lot of plants a year, even for indoor grows under HPS lights, and veg and flower them for months, whereas modern techniques call for a three to four month cycle maximum. I would recco6end it for the stuff on outdoor growing, but to be honest, the stuff on indoor just doesn't cut the mustard.