Green Thumb is a young-adult novel by Rob Thomas, creator of the television series Veronica Mars.

It was published in 1999 Pudgy misanthropic boy genius Grady Jacobs wins a scholarship to participate in rainforest research and conservation.

A healthier diet and menial labor transforms Grady both physically and emotionally, making him a better and more balanced boy.

This fantastic power eventually comes in handy when it is discovered that Dr. Carter's project would in fact lead to the destruction of the rainforest.

[1][2] Publishers Weekly and Kirkus Reviews both gave Green Thumb favorable reviews, with Publishers Weekly writing "While this book is aimed at a slightly younger audience than Thomas's previous YA titles, Grady's knowing, flip tone will appeal to Thomas's older teen fans.