What to say about a book

I’ve written this fantasy book that hasn’t been “discovered yet”. Part of the reason it hasn’t is that I haven’t done a good job of selling it. Maybe it’s impostor syndrome; maybe it’s my inability to write good taglines. But here goes:
Gaia’s Hands
- Professor Jeanne Beaumont designs oases of edible plants. Josh Young, English instructor, sees visions of danger approaching Jeanne and her talent for making plants grow inches overnight. Josh’s visions prove true as Josh and Jeanne install her dream garden — to face trial by fire.
- Professor Jeanne Beaumont’s plants grow impossibly lusher and taller when she talks to them. Josh Young sees visions of Jeanne surrounded by a vast garden with a violent storm on the way. Josh and Jeanne must weather dire events and their eerie adversary — and they will face fire in Jeanne’s most ambitious garden.
- Josh Young sees a vision of horticulturist Jeanne Beaumont standing in a lush garden, facing a deadly storm. He must work with her to help her face her talent of making plants grow inches a day. Soon they face an ever-increasing threat which will try them by fire.
So, any of these? None of these? I’ll try longer ones later.