Nice, easy to read book that is well illustrated and provides an extensive survey of Lavandula species and cultivars. Surprisingly, the author gives no information as to hardiness zones for the various plants covered. Also, in the cultivation chapter there is no mention of exposure.
This is a book by an Australian author on the different species of lavender. I find it extremely useful when trying to identify a particular type of lavender as it has a large number of very detailed pictures.