
After clearing the decorative rocks away, it could be clearly seen it was not planted deep enough. The base had a rounded, bulbous shape which allowed it rock about. It was decided to build a raised planter enabling the palm to be buried deeper.
After the planter was constructed, angle iron stakes were driving in at 8 points surrounding the planter and chains used to hold the palm back upright.
Some John Innes #3 was then packed and washed in around the lowest part of the air gap covering up a few exposed roots.
To hopefully guard against rot, several bags of sharp sand were then mounded up immediately around and next to the trunk. This would help hold it in place, but be very well draining. The rest of the planter was filled with about 50 bags of John Innes #3, tamped down and watered.
Since the repair, we've had several other good gales, but the palm appears held rigidly in place and hasn't budged. The trunk is now about 6 inches deeper than it was.
Thanks again to everyone's thoughts and suggestions!
