I wintersowed some Unwin Dahlia seeds and had excellent germination. I've since planted these out and they are doing well. The other day, I was digging through the clearance bulbs at Meijer and they had Unwin Dahlia tubers. I didn't buy any (moldy looking), but this got me to thinking....will the seedlings I planted form a tuber underground that I can dig up in the fall, and save for next year?