(Upland Cress) (BARBAREA VERNA) [17th century Portuguese sailors shipwrecked on Canada’s Belle Isle survived the winter thanks to these greens.] A traditional winter green all across the Mountain South. Dark green leaves are high in vitamin C. Transplant or sow anytime, but best sown in August for winter greens. Seeds can take 2 weeks to emerge. Yellow spring blossoms help nourish ladybugs, syrphids, and other beneficial insects.