The Potion Gardener by Arden Powell

Desperate to escape a messy romance, Florian Mulberry flees London: tipsy, panicked, and without a plan. It’s while hiding in a rural garden shed that he meets Kells, a potion witch, who agrees to shelter him in exchange for manual labor until he gets his life together. Leaving his pampered London existence to work on a secluded cottage farm is a shock, but Florian throws himself into it with passionate determination.
And it’s not just gardening he’s passionate about. In no time, Florian falls head over heels for his skillful, hardworking mentor.
There’s just one problem. Florian is only disguised as a boy, and the enchantment hiding his real body is going to wear off. Florian’s main concern is how to explain himself when it happens. He’s definitely not a girl, but he’s not entirely a boy, either. With all the magic in Kells’ garden, there must be a way to achieve his ideal androgyny.
However he looks, Florian will have to face his past if he wants a future with Kells. Even if he avoids London forever, eventually his past is going to come looking for the girl he used to be.