I bought this book as a gift and I am delighted with it. Many books I see for kids are lacking in one or more respects, this book is a clean sweep on every front i.e. well-organized, accurate content, meaningful activities, good cartoons and lots of interesting facts about plants.
The book covers the history and folklore of common vegetables and fruits, various activities that teach principles and appreciate for how plants do what they do and many indoor growing experiments that educate. It even includes sections on raising earthworms, pill bugs, snails and information about growing herbs.
One nice feature of the book is the presentation of provocative questions about plants that are then answered in the text or must be answered through an experiment of some sort. This is top-notch material, even the illustrations are excellent.
Although I believe this book is recommended for children 4-8, I think it is probably more appropriate for 6-12. It is certainly fine for even a very intelligent and motivated 10 year old.