Aurora frowned a little, scouring her mental encyclopedia (thoroughly lacking in many areas) for something near to the answer. "If you over water a plant it will drown... because all the cells swell up with water and explode. And if you under water a plant it will shrivel up because there isn't enough to feed all the cells... you can use a shrivelling potion in small amounts to undo over watering if you use it earlier, and can use a conligo-hydro potion to add a lot of water without drowning it. But once they're dead then there's no way of reversing it..." was it conligo-hydro? Or inedia-hydro..? It was one of them, her mother used to make them a lot for Rufin... and they'd done the shrivelling potion in class so she was pretty confident about that. She scratched the side of her nose and fiddled with the ends of her long, red hair as she tried to remember and waited to see if she'd been right.