That is gorgeous - I've not seen that color around here yet!
If it's anything like mine, it will send up seedlings
all over next year - after the birds dine on the seeds
and scatter some in the process. Or... you can collect the seeds
when the heads are brown and dry, before the birds get to them. I usually do a bit of each. I went from 3 small plants, to what looks like a small hedge now - love it!
And from the other side (hard to get good pics on this glarey day!)