I must confess from the beginning: I'm a cannabis grower who came to this book wanting some hints on how to grow poppies. I thought a general guide to this subject might get me started. There is one problem though: this book is too old. First published in 1977 and revised in 1990, there are years of developments in this field which have just passed this book by. For a start, everybody nowadays uses kits, they are easy to get and relatively cheap, so we just don't need the pages of information on how to make your own. Plus, he barely talks about lights: presumably they weren't really used when he wrote the book. Then, the author's proselytising for hydroponics (how valuable it might be for the Third World etc), takes up room that might be used for explaining how to grow things. He just gives a few general hints and sends you to the bibliography for more information, in other words you need to buy another book! That said, the section on pests is helpful. All in all, this is a wasted opportunity, and it's surely time somebody wrote another general book on hydroponic gardening.