Cold frames are excellent for wintering over spinach and greens that are hardy enough to take the cold. Seeds can be started in late fall and then mulched to help keep them from freezing until now. I have to admit that I forgot to cover mine with mulch before the freeze but the good Lord provided lots of protection with the snow. Won't be long and we will be eating fresh greens. The cairn(a heap of stones piled up as a memorial or as a landmark) that sits in my culinary herb garden is a landmark that reminds me of the faithful ness of God for our Grouse Ridge Farm.