orange tree dying?
I have a mature orange tree that isn't looking too good lately. Some of the leaves are curling in with the back facing out. I tried to do a search here and most suggests overwatering which is not possible since we don't water... :) What makes me worry is that we have another orange tree right beside it and that one has just died couple months ago (you can see it in the pics). Is it something in the soil? How do I go about diagnosing it? Pictures here -