I don't normally do snapdragons, but in years past haven't had very good luck with certain varieties. I think certain varieties winter sow better than others. I have winter sowed "Black Prince" a few years back and was successful. I planted them out and they did "ok" that first year. The next year, though, they either reseeded or came back and did very well. Now I get them every year in the same location. Haven't paid attention if they are coming back or reseeding. I think they do both.
