Name: greene Savannah, GA (Sunset 28) (Zone 8b) I have no use for internet bullies!
That's what I was wondering also. My DD has this plant and we have never seen a volunteer. I am thinking that some are sterile hybrids and some are the old time heirloom ones that make viable seeds. That's my guess anyway.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"