This question popped up on a Norwegian site. Somebody has bought a property in Toronto. This weed(?) is everywhere:
Looks like a shrub of some sort.... ?? I mainly just wanted to say that there are no "Canadian" weeds, only introduced European ones!
Calgary, Alberta, Canada - Zone 3
-30 C to +30 C (rarely!); elevation ~1130m; annual precipitation ~40 cm
Yes, a shrub or a tree: I think they are runners from a kind of Populus or something like that.
And you are right about the weeds! I have no Canadian ones in my garden, just European ones! (The worst one is Circaea lutetiana)
Rogaland, Norway - with cool, often rainy summers (29C max) and mild, often rainy winters (180 cm/year)!
Not Populus. It looks somewhat familiar but I can't put my finger on it.
A young Rhamnus?? Around Toronto you might get the native Rhamnus alnifolia (in wetlands) or either of two non-natives, Rhamnus cathartica and Frangula alnus (formerly Rhamnus frangula).
Philadelphia, Pennsylvania, zone 7a
Webmaster for the Delaware Valley Chapter (dvcnargs.org)