There's also the possibility of self - published 'garden graphic novel' works. Some indie artists create stories set in gardens that might not be as well - known but are really interesting. These could be about magical gardens where plants have special powers, or just a simple story of a gardener's daily life and his connection with the garden. You can often find these on small - press websites or at local comic book fairs.
One popular 'garden graphic novel' series could be 'The Secret Garden' if there are graphic novel adaptations of it. It often features beautiful illustrations of the garden, the characters exploring it, and the mystery and growth within. Another might be something that focuses on a community garden, showing the different people who tend to it, their relationships, and the little dramas that unfold among the plants and gardeners.