winter hardy, tough lettuce?
Most of the greens in my greenhouse are doing great. Growing slowly during this cold winter, but still green and alive. But I lost 1/2 of the lettuce I planted. It didn't seem to succumb to freezing, but to damping off while it was covered for a day and a couple nights on three occasions. The Forrelenshlus aka speckled trout and a heirloom that I got from George (but forgot the name of) have survived the best. Both have sturdy leaves. Black seeded simpson and another mix of tender leaved lettuces did the worst. So now I need the names of more cold tolerant, thick leaved lettuces. Can anybody help?