75-85 day maturity. Lactuca sativa var. asparagina ‘Spring Tower Celtuce’. Spring Tower Celtuce Lettuce Seeds. Non-GMO, cool-season annual heirloom. This variety of Chinese stem lettuce has good tolerance to heat or cold and is slow bolting. Chinese stem lettuce originated in southern China. It is grown mainly for the tasty stalk. The leaves are broad, oval-shaped, and green in color. Spring Tower is an early maturing variety. Celtuce pairs well with stir-fried meat, poultry, or fish. Approx. 18,500 seeds / oz.