With just a little effort you can have a garden year round in Oklahoma. Right now I am harvesting sunchokes, arugula, lettuce, broccoli, broccoli greens, kale, brusselsprout greens, cabbage greens. Notice how I said greens rather than cabbage and brusselsprouts? You don't have to wait till the full heads form when there are perfectly good greens just begging to be eaten. Don't pull the lettuce or arugula up by the roots. Those guys really want to live so they will put out more leaves just for you to snatch on the next trip to the garden.