Hi Bob, I used to have a Princess Mikasa. Mine was bare root and I would dip it into a bucket of water multi times per week and had it hung in a west window during the times of the year that I could not have it outside. (which was 8 months of the year.) It bloomed 2 times a year for me. It sounds like you are doing well with it. See if you can up the light a bit and and fertilize it lightly on a weekly basis.