Winner! All seed of this variety is taken only from plants that spent the winter in Caleb's backyard garden without any protection, despite minus 19 below zero temperatures! Above is a photo of this lettuce in my garden in December, in a cold frame.  I planted ten federal seed bank accession varieties on Oct. 1 and grew them all winter without any cover or frame -- and this variety was the clear winner! I am the only person in the world to offer this seed for sale, and because I developed the seed, I got to name it :)  Works well for fresh winter garden growing as well as summer. 50 heirloom, chemical-free seeds per packet. Annual. Free shipping on orders over $34.