Purchased as an early x-mas present, delivered in colder weather, it was placed into a 14" x 15" pot with M.G. Citrus potting soil mixed with vermiculite and perlite, water pH 6.5, only when top 2-3" are relatively dry. It bloomed twice, but would leave a dark lump once the white flowers dropped. It arrived with what looked like dried water spots on the leaves. In early March, something killed the entire upper tree, all leaves, branches and down the trunk to the graft point. Since the root ball was intact, I continued to care for it, recently placing it outside. From around the graft point, several branches have since grown. All the pics are from today, and you can see the "water spots" are definitely not water. I can't figure what though. Some of the leaves have also begun to curl. And all my troubles could easily be multi-factorial. I should add the pot drains into a large drainage pan filled with small gravel. Until I placed it outside, it was next to a South facing window with no cold drafts I am aware of. Any advise would be greatly appreciated.