I actually had some brassicas seeds sowed in winter. On November 18th, I double dug the bed tomatoes used to grow and amended with shredded leaves, gypsum and biochar and transplanted several bunches of crowded garlic. In between the rows I sowed a mixture of brassicas, flax, carrot and lettuce seeds. I was hoping they would sprout quickly as living mulch. The cold airs hit early this year and we had multiple days below freezing plus snow down to 22F/ -5.5C. Today the snow thawed and I got to check the seedlings finally. Most of them emerged unharmed! They probably will grow very slowly through the winter but this is a good opportunity to test their hardiness. If they do make it, I will pull the garlic geeens and mix in compost in the vacant furrows. If not, they are easy to start indoors anyway.