Did exactly the same with mine in pots. Interestingly, they also thrived in the bog garden adjacent to my pond! Was very surprised! Vaseline is a very good deterrant for pots! I remember being dragged ( as a youngster-20 or so!) around nurseries by Ma, in the big quest for hostas. Vowed never to garden! Come 40, got the but and all down to hostas! They are so versatile, I love them, even if their pretties are a little insignificant!
Kate