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- A cold hardy long day favorite for Western states that develop large yellow bulbing onions with a mild sweet flavor.
110-115 Days to maturity. Allium cepa. Utah Yellow Sweet Spanish Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, raised beds, and containers. This yellow onion is considered a long-day type and may be grown in intermediate-day regions as well. Recommended by Utah State University and is the state vegetable of Utah. Large bulbs weighing over a pound have great storage capabilities. This Spanish Onion is relatively easy to grow with moderate pink root tolerance. ~7,000 seeds per ounce.