Preserve Small Palm Trees
Spread clean hay or pine straw around the base of the palm tree in a circular pattern, using a shovel or pitchfork. Stack the material up as high as possible in a mound until you completely cover the top of the palm tree. Leave a lot of air in the material, and do not pack it down, since the air acts as an insulator.
Place an upside-down cardboard box on top of the palm to provide further protection. Stuff the straw or pine straw up under the box as much as possible.
Leave the box and the straw on until the temperatures rise above freezing. Do not leave it on for longer than five continuous days. Leaving it longer than this period of time will cause rotting.
Preserve Large Palm Trees
Place a roll of burlap against the palm tree trunk as close to the ground as possible. Wrap the burlap around the trunk tightly twice and then angle it upward to begin wrapping it around the remainder of the trunk. Continue until you reach the bottom of the canopy where the fronds start.
Use a tape measure to wrap around the trunk and determine the circumference. Cut four to five pieces of twine that are at least twice the circumference.
Wrap the pieces of twine around the palm tree trunk at equally spaced intervals to secure the burlap.