Organic Little Gem Lettuce 200 Seeds #7032 Item Upc#650348691783 33 Days. English greengrocers offer this miniature green romaine with its blanched, thick heart as a gourmet treat. Heads are about 4 inches across and are prime eating from 4-6 inches tall. 200 Seeds Plants can be spaced 6 1/2 by 6 1/2 inches for maximum yields.