There are 2 books by Dan O'Brien on BookOrb. A strong starting point is Gardening & philosophy (2010). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Dan O'Brien written?
BookOrb lists 2 books by Dan O'Brien.
Where should I start with Dan O'Brien?
A good starting point is Gardening & philosophy (2010).
What is the Dan O'Brien books in order list?
In publication order: 1. Gardening & philosophy (2010), 2. Gardening - Philosophy for Everyone (2010).