I have no personal experience with E. alata in Alberta. I only know that this bush is invasive down here and have a report that it is invasive in Ontario as well. If they are selling it "all over town," it sounds as if it is not difficult to propagate which means it will spread in the wild as well. I implore you, please check out its invasive status in Canada before you plant it. Good luck!
The plants which are terribly easy to propagate--too easy, really--are the ones which unscrupulous vendors can sell many of quickly without a large overhead expense. Some of these introduced plants, in turn, have so few natural enemies in the wild that they out-compete the native plant populations. Be careful, and remember to have fun!