70-110 Days to maturity. Allium cepa. Southport White Globe Onion Seeds. Non-GMO, annual, open-pollinated, heirloom, cold tolerant, bulbing, long-day onion. Suitable for growing in greenhouses, garden plots, and raised beds. Southport Onion produces medium size white globe-shaped onions. They are firm and pungent onions great for cooking, imparting a nice strong onion flavor to your favorite recipes. 9,000/ounce.