This is a wonderful book. Because it explained plant growth in an accessible but thorough way, I am now much better able to prune my plants than I ever was after reading books about pruning. I understand so much more about how plants grow by understanding the science of it and just the nuts-and-bolts of how plant hormones and apical meristems and axillary buds and what not work. There's so much good stuff in this book that you may not want to read it straight through but rather read it part by part and consider how the info in each part might impact your gardening before moving on to the next part. The only weakness of the book from my perspective is that it really doesn't spend much time on roots (or at least doesn't give as much interesting, useful information about roots as it does about other things). It could also maybe spend more time on germination and seeds.
Actually I read an older (1990) edition of this book. I found it to be very informative and easy to read. Concise and clearly written. The language is not too technical, and the target audience is gardeners who are interested in learning more about the science of plants.