(OP) Barbarea verna 50 days. One of the most cold hardy salad greens available! These peppery leaves are not only tasty, they are also packed full of vitamin C. Upland Cress was eaten in colonial times to ward off scurvy throughout the winter. Flavor and nutritional value are at their peak in the dead-of-winter. Attractive yellow blossoms. Approximately 200 seeds per 1/4 gram.