So far so good. The temps inside have never gone below -2*C since that cold spell. I will open up the shelter when it gets close to 0* sometime around January 1st. While I install an emergency heat lamp, I can check and see if the light and moisture levels have been good and if the Yucca elephantipes has shown any damage yet.
Allen
You don't have to be crazy to grow palms in Alberta..... But it helps
Sure working well for you, Allen.
Barb
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If you drink, don't drive. Don't even putt.