Mild onion, easy to grow. A long day onion, Stuttgarter Reisen is a longtime favorite storage onion—and it's easy to see why. Producing medium-large yellow onions at maturity, the bulbs have a mild, smooth to slightly pungent flavor that make them ideal for sautéing, grilling and cooking. They're also fantastic when sliced raw in salads or on sandwiches. Bulbs are uniformly sized with a slightly flattened shape. They're excellent storage onions and can be kept in storage for several months after harvest. For mild-tasting green onions, harvest onions about 2-4 weeks after planting onion sets. For larger onions, allow the onion bulbs to grow through the summer.