@gjones I grow these in a pot. After they have finished their cycle they die off and I leave them alone only watering occasionally. They have a small tuber which regrows every year. I have had this same plant for over 10 years. 💜
They are hardy here! We grow them in the ground. Some of our hardy plants tend to self seed and take over if given a chance. But if yours are in a pot they probably won't do that! Impressive plant that comes back for you year after year!