These people carry the seeds.
https://www.plant-world-seeds..... They grow wild down at our rural cabin in Central TX. But we don't go there so much when they are popping out. And I have yet to be able to collect seeds. The come and vanish so fast and are so small, you can barely dig the plants out of the ground. If we get down there during their season this summer, I'll try to contact you folks if I am able to dig any up successfully.
