I must say, at first I was a bit skeptical about winter sowing. However, my broccoli winter sowing experiment has been a tremendous success. Check it out! This juice container was planted back in February. The plastic container protected it from the relentless snow. Now it acts like a little greenhouse. Look how healthy the broccoli plant looks! It looks even better than the ones I started indoors!
Here's a photo of the "greenhouse" juice container. You can see all the condensation along the sides of the juice bottle. It's important to also keep the cap off. You have to be careful if this is directly in sunlight, it gets really hot, and can cook the little seedling. Keep a watchful eye on it.
For comparison's sake, here are my broccoli seedings that I started indoors. As you can see, the winter sown ones are much larger and healthier looking. I am totally going to winter sow all my brassicas for the vegetable garden for 2012. I am not going to even deal with sowing these indoors anymore.