Lettuce Claremont D2357A (Green) 200 Seeds by David's Garden Seeds Days to Maturity: 28 Non-GMO, easy to grow and hand packed here in the United States by David's Garden Seeds. The upright heads of this specialty lettuce average 9 inches tall Deep green leaves with delicious, crispy ribs are open at the top, tapering elegantly to form a dense heart Germination rate: 70%