Iya Sol Romaine Lettuce Seeds. 55 days to full maturity. 29 days to maturity for baby leaves. Lactuca sativa. Heirloom, Annual. A loose-leaf romaine type. Iya Sol's leaves have a shiny quality to them even at the baby leaf stage, and the red-colored leaves have a slight frill to them. Approximately 25,000 seeds/ounce.