凌 9 Vegetables You Can Buy Once and Regrow Forever Green Onions Roots in water sprout new stalks in just days. Romaine Lettuce Base in water sends up fresh, tender leaves. Celery Cut base regrows crisp stalks when kept in water. Garlic Single clove in soil grows into a full bulb or green shoots. Leeks Root ends in water regrow tall, flavorful stalks. Basil Stem in water forms roots, ready to plant in soil. Potatoes Sprouted pieces produce a new crop underground. Carrots for greens Tops in water grow fresh leafy greens for garnish. Ginger Rhizome planted in soil produces new harvestable roots.