11. Green Onions
Green onions are often the first vegetables people try to regrow from kitchen scraps—and for good reason. Just save the white bulb with roots intact and place it in a glass of water. Set the glass near a sunny window and change the water every couple of days. You’ll see fresh green shoots within days. Once they’re a few inches tall, you can trim and use them or transplant to soil. They’ll keep growing back again and again.