Hi Katya. It looks quite a bit like Pittosporum tenuifolium 'Silver Sheen' to me. Silver Sheen is a fast growing shrub/tree that tends to pop up everywhere as it grows wild and is often used in ornamental gardening. Wonder if that could be it.
Haha - I just saw on one of your other posts that you're in the West Kootenays. Now I'm positive it's cottonwood!
posted 1 month ago
Ha! Indeed, we are in the West Koots, and yes, I think you are probably exactly right... Black Cottonwood is my guess too.
I am thinking of trying transplanting one our in front of our yurt. They seem to grow really fast and I need a good fast growing tree, as we are in an off-grid yurt, and it gets horribly hot inside w/ no A/C.