I just purchased a phoenix roebelenii a little over a month ago. I repotted it into a large pot and placed it on my patio. It receives minimal direct sun, but I read these trees prefer shade anyways. The tree is fairly mature, i'd estimate several years old. Its oldest fronds have began to die within the past week. They began to get brown tips and then just lost all their green color within 2 days, and are are brown/purplish color now. I have not cut off these fronds yet, but am getting close since they are pretty much dead.

What would cause this? I'm watering the tree healthily once a week, it is planted in a palm tree mix with peat moss and sand to ensure good drainage, and I have rocks at the bottom to permit proper water drainage.

The tree looked great, but its apparent it does not like something now. Could this be a result of transplant shock? Its not as if the fronds are just dying and turning the standard brown, its a different shade of brown/purple which leads me to believe something else is at play.

I have pictures if you would like - please let me know and ill email them.

Any help is appreciated.

Thank you.