Here is the web site showing this process.

http://www.wintersown.org/wseo1/index.html

Yeah...I winter sow...people used to do it in cold frames before the plethora of plastic containers. My best results are from Red Vines containers and from Park's domes. I just never have the same luck out here with our damp springs...most of my stuff germinated during our warm January, then just sat there. There are all these flowers in the nurseries and I have seedlings. Very frustrating.

winter sowing is the way to go if you dont have room for inside light set-up. For me, it gives me something to do in the winter months. Here in the northwest, too much rain in the spring will water log your containers. Make sure you have alot of drainage holes in your containers. Next year, I'm going to try a lot of perlite in the bottom of my containers. Mine got too soggy this year. Had pretty good success, though.