mine all died in the frost but since it is first yr i planted dont know if they will come back in spring or how much they self seeded. i do know it is really pretty and the bees and hummers loved it. not much help sorry
Thanks for your comments. I loved the look of the plants that I just spotted on a thread here on DG but figured this time I'd ask first before it turns into another monstrous problem for me like the Houttuynia did.
According to the USDA it grows as an introduced species in Oklahoma and the Gulf Coast states, suggesting that it is not especially suited to your New York climate, so it is probably not an invasive threat for you. I could be wrong though.
I live in zone 8b and my 3-gallon plant, which I planted in the ground, died in the first hard frost - I don't think they are as hardy as sellers claim. I would love to have another, if anyone has one to trade - will put the next one in the greenhouse!