Finally planted in the ground after 32+ years, the Windmill Palm is enclosed in a hut for winter...
Minimum temperature so far this winter was on December 14th, 2009 when temp dipped to -20.6C (-5.1F). An electric Patton heater inside the palm hut maintained -2.0C (28.4F).
On mild days, the door is left open with the heater turned off.
"That's me guarding the hut," attests Kia.
