On the zinnias at least, I would wait to sow them till early spring. I've been growing them from seed in a similar zone for several years and almost never get volunteers. The cosmos should do fine; I haven't planted them deliberately for several years and I still keep finding them (and always in places I don't want them! ). The petunias should do ok, too, although as many as I plant, you'd think I'd have them popping up everywhere.
Confidence is that feeling you have right before you do something really stupid.
). The petunias should do ok, too, although as many as I plant, you'd think I'd have them popping up everywhere.
