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Hi Michele! As far as I’ve read, all hawthorn is safe. I’d say, keep an eye on the trees and observe the new leaves and flowers as they form to confirm you have got Crataegus. Then, you can perhaps collect some leaves and use them with a local ID book to determine which hawthorn you have found. If the hawthorn was planted, it’s likely to be European Hawthorn (Crataegus laevigata) but there are also some native, wild hawthorns in Quebec. I found this site that lists some of the wild varieties. I hope this helps! Feel free to post some pictures here if you want some help with identification.