Green Girls by Michael Kimball

Jacob Winter is a man of principle.
Unequivocally devoted to his wife Laura and their son Max, Jacob does not drink, does not own a television - and as a fiercely uncommercial writer, he simply does not believe in the necessity of plot.

But Jacob's principles are put to the test when he catches Lauren in bed with a psychiatrist -- with predictably violent results -- and finds himself bailed out of jail by a mysterious woman from his past.

For a man who disdains extravagant storylines, getting caught up in the strange world of Alix Callahan, fiery lesbian ethnobotanist, and her bisexual partner, a sultry Americanised rainforest Indian called July, is a shock to the system. And when he ends up at Green Girls, their tropical flower shop on the coast of Maine -- complete with hallucinogenic herbs and a mini-jungle full of deadly poison-arrow frogs -- Jacob finds himself tumbling headlong into a real-life plot he never could have imagined.