This mixture is composed of four lettuce (Lactuca sativa) varieties: two leaf types (Red Sails, Black Seeded Simpson) and two headed (Freckles Romaine and Parris Island Romaine). The beauty of this mix is its dynamism. While we primarily grow and harvest the plants for bagged lettuce, it's possible to sow seeds a bit thicker, harvest the leaf varieties, and keep the romaine types for full sized heads. It's a good all-season selection, due to the staggered growth rates of the specific varieties: the faster growing Black Seeded Simpson and Red Sails are perfect for early harvests in the summer (but grab them fast, because they bolt quicker in the heat), while the romaines get their time to mature for full head harvests. During cooler seasons, the leaf varieties are slower to bolt and can be harvested for full sized heads, while the romaines work excellently for baby leaf harvests.