Super Sweet Yellow Onion is a celebrated heirloom variety that delivers robust flavor and exceptional storage capability in a compact, upright plant. These long-day bulbing onions mature in 100 to 109 days and thrive across hardiness zones 3 through 9, making them accessible to gardeners in most of North America. Known by its alternate name Stuttgarter Yellow Onion, this open-pollinated cultivar combines the reliability of a time-tested variety with the sweetness that makes fresh onions genuinely crave-worthy.
3
Full Sun
Moderate
3-9
36in H x ?in W
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Moderate
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Super Sweet Yellow Onion earns its reputation through a perfect balance of flavor intensity and keeping ability that few other yellow onion varieties achieve. The robust taste distinguishes it from milder storage onions, while its legendary shelf life means you're harvesting vegetables that will sustain your kitchen for months. This is a long-day variety, which means it naturally bulks up when day length increases in spring and early summer, making it especially rewarding for northern gardeners who plant early.
Super Sweet Yellow Onions shine in applications where their robust flavor can assert itself rather than fade into the background. Caramelize them low and slow for deep, complex sweetness in soups, gravies, and classic French onion soup. They slice beautifully raw into salads and sandwiches, grill well with their natural sugars becoming even more pronounced, and roast into tender, golden rounds. Their excellent storage means they're workhorses for year-round cooking, ready whenever you need onion depth and character in a dish.
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Harvest Super Sweet Yellow Onions when the foliage yellows and begins to fall over naturally, typically around 100 to 109 days after planting. Once you notice the tops dying back, stop watering and let the bulbs cure in the ground for a week or two if weather permits, allowing the outer skin to toughen and seal. Gently lift bulbs with a fork or pull by hand once the soil dries slightly, being careful not to bruise them. Brush away loose soil but leave the papery skin intact, then lay them out in a warm, dry, well-ventilated spot to cure for several weeks before storing.
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“Stuttgarter Yellow Onion originated in Stuttgart, Germany, where it became a cornerstone of European kitchen gardens and small-scale agriculture. The variety's journey to becoming an heirloom reflects centuries of selection by gardeners who valued both flavor and the ability to store onions through winter without refrigeration. As an open-pollinated, biennial variety, it represents the kind of vegetable knowledge that families preserved and shared across generations, eventually reaching seed catalogs and home gardeners worldwide who recognized its enduring value.”