I have a yellow flowering hibiscus. Recently it has stopped flowering and has lost a significant amount of leaves, but has some new growth where the leaves were lost. It sits in a very large pot in front of a window that faces south, with stones at the bottom for drainage and organic soil. I have fed this tree miracle grow and it seemed to do very well with this. What am I doing wrong or is this a seasonal, cyclic type of behavior? Thanks for any and all of your help.