I had two old editions of this book and am impressed with how much more information this new edition has in it, especially the color photos and drawings. The color drawings of different nutrient deficiencies really helped me out. It is quite complete, logical and information is easy to find. Jorge covers all kinds of new growing techniques and keeps them simple. The troubleshooting chart and complete index saved me a lot of hassle. I am a professional and still learned a lot from this book. My copy is only four months old and the pages are already dog eared! Thanks Jorge!