Great job on both explanation and pictures to clarify the method.
This is my 7th year to wintersow, and I have filled my garden beds with wintersown flowers in that time. Though I'm not much of a veggie grower, I do wintersow some tomatoes each year, too. Growing from seeds not only saves money, it opens up a whole new world of plants to us that are unavailable at local garden centers. While I still start a few select heat-loving plants inside under lights, the vast majority of plants in my yard have been wintersown.
Like most people I too was a skeptic when I came upon this method on another garden website. I was encouraged by folks there, including Trudi Davidoff, and coached along. I was amazed at the results, and I continue to be thrilled when those seeds *pop* in spring. Those seeds that sprout and grow so naturally are so much more rewarding than those that I coax inside with fluorescent lights, heat mats, and tlc.
Karen