Quote:
Originally Posted by giallo
Mature windmill palms can handle a decent blast of cold. I think -14c is that magical number when you can start to see serious damage taking place. A prolonged spell of -14c or below temps will kill the tree's reproductive organs, and it's game over. They'll survive a short intense freeze.
Vancouver's low during that last arctic outflow was -9c, so most trees would be fine.
The real killer of these windmill palms is the summer. They need water, especially if they've been planted recently, and our summers are getting hotter and drier. Parks Vancouver planted a bunch of mature palms along Sunset Beach a few years ago, and all but a couple were killed off during the summer of 2021.
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Also, most of the palms are in areas that are even milder / more protected than the airports. The coldest during the deep freeze in February was -9 at the airport, but only -5 on the downtown peninsula. Victoria bottomed out only between -6 at the airport to -2 near the water (so the term “deep freeze” seems to be used much more loosely than the rest of Canada).
These palms are also all throughout Japan which has a similar winter climate as the south B.C. coast.
And yes, 2021 was a bad year for the palms, especially juveniles. The heat dome killed quite a few (+40 temps are just as bad for windmill palms as -14, especially when combined with drought like conditions) and then after that intense stress they were hit with the coldest temperatures in decades that winter (hitting -15 in the colder areas and around -11 / -12 in the sheltered areas).