Last year I bought a gorgeous hibiscus called Purple Galaxy. It thrived and produced many blossoms. I brought it inside for the winter and it remained green and lush, even bringing forth more flowers while in my sunroom. I brought it outside to spend the summer on my front porch (northwest orientation) where it was last summer. Now the topmost leaves are quite tightly curled and I see no buds forming. When this started, I unpotted the plant and found it was quite rootbound, so I put it in a larger pot. Maybe I went up too large? It's also having a yellowed leaf about every other day for no explicable reason. (It's getting fertilized with time-release sprinkles.) Does anyone have any ideas?