Gaia's Garden was recommended to me by a Canadian, it is a great source of information to help understand the concept of permaculture. It goes through ideas of what is a plant community and on to how to design a ecological garden. It explains how to make gardening easier and more productive, also of how to enchance wildlife into your garden. For anyone who wants a good how and why to do it, this is the book I would recommend. I would have given five stars but for the fact it does lean to USA plants rather than UK but that aside it is packed full of information which is transferable to our shores.