The other reviews here are inadvertently misleading.
Yes, there is a season by season guide but this is a relatively small part of the book (approx 20 pages of the 128 pages). Much of the book is about types of greenhouse, siting, ventilation etc. which is of very little use if you inherit a greenhouse or have bought one based on cost or size but just want to know what to put in it.
Also, be warned that the majority of the growing information is related to flowers. We wanted a book on growing all sorts of things but primarily fruit/vegetables that would ultimately go into an allotment. As a result, only about 10% of the book is of any use (to us), the rest is worthless (to us).
Clearly the other reviewers got a lot from the book. Just be warned it may not be for everyone.