Two years ago I planted my Sambac Jasmine in the ground. It flourished and gave me over a hundred flowers every day. Last year, it did not have much new growth, but still had flowers-- about half as many as the year before. This year, most of the leaves have fallen even though it still tries to bloom. It is getting as much, if not more, water than the first year. It gets part sun. It's got fertilizer. It is mulched. Can anyone point out to me what's wrong?

This is actually the second time I have this happened to me with the Sambac Jasmine.