This is a very good guide to rhododendrons and azaleas. The detail is excellent and the range of varieties covered is more than anyone could ever consider growing, no matter what size their garden, or dedication!
There is a very detailed section on growing and maintaining these plants, with good detail on soil types and for those who don't have the right kind of soil, what to do to improve it.
There are also lists to the best plants for various catagories, by colour and hardiness among others.
Having learned the hard way what not to do, its very reassuring to find this level of detailed knowledge, I could have saved myself some losses.
Would recommend this book to anyone who is interested in growing rhodondendrons and azaleas.