I planted a 7 gallon Navel Orange tree about 3 months ago. I watered daily for about the first month or so, weekly soakings. Over the past month/ month and a half I have let natural rain do the job. I have never fertilized per the opinion here on the forums.

Over the last few weeks some of the leaves are turning yellow and almost daily I see green healthy looking leaves dropping onto the ground. Sometimes the leaves towards the bottom of the tree looked wilted. Is it the heat? Not enough water? Please help as I don't want to loose this tree. Thanks.

*one side note, a few weeks ago I got a white flower than it went away. Not sure if this means anything.