Is this leaf spot fungus
We bought this on a trip to the mountains (Tennessee I think). It is only supposed to grow there (some special color) Knowing it would probably die, we brought it back to FL, where it has been in a pot for about 4 years, refusing to die, but only producing one flower. This spring, I planted in on the south side of the house, where it gets full sun until about 11:30. Then it is fully shaded by an oak tree.
I was wondering if this is leaf spot fungus and is it to late in the year to treat. You can see from the pics that the buds? have popped out. Thanks for any help.