Lettuce Seeds - Winter Density
(Lactuca sativa) 65 Days.
If you are into four season gardening, congrats; You've found your new favourite lettuce!
Winter Density (odd name, we know...) is #1 for cold hardiness. No, it won't hold up in 30 below, but it does do extremely well into the Fall & even early Winter with protection.
Winter density is a mix between romaine & butterhead lettuce (stable open pollinated cross, not a hybrid). Heads grow upright like romaine, but leaves are more tender than crisp.