Growing vegetables from food waste is a great lesson for kids and also makes great science experiments Teach students how to regrow food and pick a food to regrow as a class. Could use a food from a students leftover lunch.
Dream State: Grow Your Own Ginger At Home - start it indoors early in the season, as a houseplant. Then move outdoors into your garden in the spring. Every "finger" of the old root will produce a new ginger root.