Quote:
Originally Posted by lio45
Yeah, I did mention the relative lack of rain in my list of factors. But you're probably right in insisting on its importance.
I'd think at first sight that long-ish periods of dipping deep below zero after the buds have emerged would be a killer too. The Eastern trees have not evolved to face this, though they can survive -40C.
Speaking of Eastern hardwoods, I seemed to recall that the American Elm's native range included the Canadian Prairies, so I just looked it up. It stops at mid-Saskatchewan. Is Edmonton really drier than central SK? I thought the Parkland Belt (or is it Ukrainian Belt?) had relatively similar characteristics from East to West. Turns out it's not the case, at least for elms.
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Thank you for reminding me and I can't believe I forgot about Calgary's Elm trees! Seeing as we are in the middle of the prairies we are one fo the few cities that has not had its elm trees decimated by Dutch Elm Disease. Most of the older neighbourhoods in the inner city and even some older burbs have amazing elm canopies.
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