The Little Book of Little Gardens was released late 2012, published by Dokument Press.

More information, including where to buy it can ber found here: http://www.thelittlebookoflittlegardens.com/

Here's the trailer...

The Little Book of Little Gardens is an artistic demonstration and playful collection by Steve Wheen, the internationally acclaimed 'Pothole Gardener', whom The Sun describes as the "Banksy of guerrilla gardening". This collection brings his best work to life, creating a photographic journey through some of London's most iconic locations.