Lactuca sativa Item #3102 68 days. Also called Sucrine or Sugar Cos, Little Gem is an English heirloom that is a very small variety of romaine, but has the succulent sweetness of a butterhead. The glossy-leafed heads are a petite 6″ tall and 4″ wide — a perfect size for an individual dinner salad. The tender blanched heart is ideal for any recipe that calls for “hearts of romaine”. This packet sows six 10-foot rows.