@walker: It comes back every year. I planted it in 2006. When winter comes, I just let it die and leave the debris there to cover the roots. When spring starts warming up the ground, I clean all the dead foliage off, and new sprouts begin popping up. The wilted leaves sometimes are still a bit green, so maybe they are producing some nutrients during the winter. It will also come up from seeds around the mother plant.
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