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Winter Giant Spinach Seeds. 50 Days to full maturity. Heirloom, Open Pollinated, and Non-GMO Seeds. Spinacia oleracea. AKA: Giant Winter Spinach. Giant Winter Spinach was selected as a late fall/early winter crop. The leaves are large, savoyed, and deep green. Winter Giant Spinach is very cold resistant. Popular in winter as it can be grown and harvested in the cold months for a fresh addition to …