This is what I found:
"They are easily grown from seed which may be sown directly into the garden from early spring up until early summer, where they will bloom for you the first year."

Here is a link that might be useful: More info

Mine self seed and the seedlings over winter just fine here in zone 8.
Jan

Thanks ya'll, think I'll sow some seeds this week and see if they will make it through. They are such a happy flower!! I traded for a small start of what I think is "Goblin" and they have grown and bloomed non stop for me. I found a mixed pack in seed sale,and from them, I hope to add several colors for next year:-)