Here's the official word from Timber:
We're scheduling events now and I will be talking to Timber later today. As I understand it, from the release date it takes several weeks for the books to get into bookstores because they go through distributors.
Greg and I have scheduled an official book launch at San Diego Botanic Garden on March 23. They will be charging $10 for the event (plus admission if not a member). We will be talking about the process of writing the book, a little about the content and will also be selling and signing books.
We're both very excited about it all and so appreciate your support!