Do you grow these every year from fresh seed or do they self sow?

Since the first year growing this heirloom variety, they have self sowed near where I originally planted them! they come up really well on their own!

Thanks for the info

I do save seeds so if you would like some just send me a treemail and I'll be happy to send you some. This year only a few sprouted but they were very strong and beautiful, I think..