Lettuce Black Seeded Simpson (Net Wt. 500mg.) Matures in 45 days. This fine loose heading variety has very light green, frilled and crumpled leaves with a fringed edge. Forms a compact bunch of crisp brittle leaves of excellent flavor in a remarkably short span of time. As heads develop, cut every other one to allow others to develop. For continuous supply, plant every few weeks throughout the season.