Emily, those yogurt cups actually last longer than you think. I was very sick most of the summer of 2006, the first year I wintersowed. I had sown all of these seeds and cut up the stupid yogurt cups, then I got sick after having planted out very few. I had 3 major abdominal surgeries in 3 months. My husband felt bad that I had started all these plants then couldn't plant them. He planted almost all of them. He make some plant markers and left them in the flower bed for me to find later. I've left them there ever since. This past summer, 3 years after having them placed there, they looked liked this. This is black paint pen on cut up yogurt cups 3 years later.
This is what happens when husbands help.
Karen