Hello folks! The Oak Leaf lettuce dates back to the 16th century. It's an 100% Non-GMO seed. It's a leaf lettuce and grows in shape of oak leaves. We have a premium strain, and you will get great value if you order this bulk Heirloom lettuce seed. The Oak Leaf lettuce seed is great for our customers in the warmer climates; it will not get bitter in the heat. And as with all lettuce, it's a cold hardy vegetable. Happy growing!!!