Sabal palm browning

[Futuresvt]

Planted these on March 21st this year. I watered heavy in the beginning almost daily. It has been an unusual cooler summer for us in Georgia. Haven’t had a day in July over 90. Lots of cloud cover and rain. When I check the 3-4 inches of mulch is always damp. I added some sand to our clay soil when I planted the palms. The spear is still green with no or very little signs of new growth.  I have added some of the Jobes organic palm fertilizer about 3 weeks ago. I went on the lighter side and used about 2ish cups per palm. 
 

Why do I have one palm starting to brown more than the other two? Should I be concerned?

[Futuresvt]

Many people say to cut all fronds(like hurricane cut) to help root growth. Or should I leave the green and brown fronds?

[zimm]

You are 4 months into planting so I would think you are past the initial shock point.  If the spear is green I would think you are good, but potential concern if the inner spear looks dried out or thinner/dried than the other.  For any new ones I have gotten the outer fronds are always a bit iffy and a few seem to go brown while establishing.  I would say if the spear seems good, let it go and don’t worry.  Personally, I avoid cutting any fronds until completely brown so they can reclaim any nutrients from the frond.  Those look decently cut back from what I’ve gotten in the past.

As a side note, isn’t it horribly frustrating that over AND under water symptoms are browning?  Might consider if either is getting any different watering from elevations, etc.

[Futuresvt]

Thanks for the feedback. I’ll look into the watering some more. Yes it’s incredibly frustrating not knowing how much it’s actually getting due to my soil. A lot of the dirt in the area has been recently back filled for our new pool. My wife keeps telling me that the palm is dying. Haha she isn’t convinced I know what I am doing. The local plant nursery recommended windmills for our location but I think these Sabals will make it just fine. Maybe some protection in the winter. 
 

Picture of when we first installed