Yellow onion sets are a great choice for gardeners who want tasty green onions or scallions just weeks after planting and storage onions next summer. Onions sets are extremely quick, producing mild-tasting green onions in 2-4 weeks. Always plant in Full Sun with fertile, well drained soil. A window box or patio container can be used if you do not have a garden. The mature bulbs are flattened with crisp, yellow-white flesh and papery skin. They're a good choice for storage and for flavoring in cooked recipes.