Produce is expensive and easy to waste. Stop tossing the scraps and try planting them. The result is fun and easy, plus it may save you a trip to the store.
To Grow Green Onions. Once you master this trick you will never buy a green onion again. Just hang on to the white part of the onion with the roots left. Use about ½ inch of water and place the onion in a short glass on your counter. These onions grow up not out, so start with a short glass and move it to a taller glass when necessary.
Celery. I learned this from a friend. Celery is a pretty plant and easy to grow. While visiting with a friend I stopped to admire a plant on her front porch, turns out, it was celery. Cut off the bottom two inches of the base of the celery stalk (where all the stalks meet) and place in a bowl with ½ inch of water. In a few days you will see growth in the center of the plant. Transplant the entire plant to a pot and watch it grow till ready to pick.