I didn’t get to planting greens for winter in the hoophouse this year. Exactly when they need to be planted depends on the specific crop, but even the quickest growing greens (like spinach) shouldn’t be planted later than September in this area. (At least, they shouldn’t be planted later if you want them for harvesting over the winter. They’ll still grow, but they won’t be ready until spring.)
Last year, I planted quite a variety of things in the hoophouse to see what would do well over winter. It was our first year having it and was one huge experiment, but it went pretty well for the most part. Some favorites were identified, as were some that seemed more trouble than they were worth. And then there were some that seemed worth a little extra trouble. This year, though, I had to give my bees top priority. For that and various other reasons I didn’t end up planting much in the hoophouse for this winter. But as I was looking around inside it recently, I noticed that there were a few different greens and other vegetables growing amongst the weeds. There were radishes, mizuna, lettuce, Tokyo bekana, chard, maché, mustard greens, leeks, and what appeared to be a Tokyo bekana/mizuna cross. I had left some of the plants we had been eating over the winter go to seed to collect seeds from in the spring. I’m sure some of them ripened and fell early, or late, or just got missed, and wound up on the ground.
That accounts for most of what is growing out there. A small amount of it I did plant, and some of it is perennial plants that were planted last year. Eventually, the hoophouse will probably be full of mostly perennials, but some of the very best cold tolerant winter crops are annuals, so there will always be a place for them too.