When this tree (9 feet tall) goes dormant, does it lose all its leaves? I have been battling yellow dropping leaves since I got it at a yard sale. It is in my sunniest room and I think it was outside. I'm sure it is stressed, as I took it home in my car. I don't see bugs, but I did use a bug spray on it. Should I try Dawn dishwashing soap? It is still flowering but dropping leaves like crazy.