Hello, I just bought three of these beautiful plants and I am hoping that someone might be able to share some tips with me on how to keep them healthy. I bought one a few years ago and planted it in a part sun location at the bottom of a slope where it may have gotten too much winter moisture and died. How much winter moisture is acceptable? I have put my new plants between the stones of a staircase, where they get a good amount of sun, but are protected slightly from winter rain by the branches of a pine. Here in Oregon, however, it's impossible to keep any plant dry in the winter. Should I bring them indoors for the rainy season? Thank you.