Well I really have no way of telling from just that, but I hope that it is just a guest and not an invader. That said, though, I am not sure I have ever had just a guest to my garden that was at all welcome, so I would have to guess you have an invader on your hands. I am also not very familiar with those wither though, but best of luck to you. Thanks for sharing.
Knapweed of some sort, maybe? (in which case, probably unwelcome.)
I'm really not sure though. However a wrong response usually brings out the more knowledgeable plant identifiers.
Whatever it is it's afflicted by leaf miners. Those squiggly lines on the lower leaves. You sorta don't want those in your garden. Neem oil works well to kill those off.
Seems like it's a nice looking plant, I wouldn't cut it down if I were you. If it's not annoying you and your other plants then you definitely should leave it right there where it is, it looks beautiful!
This is Velvetleaf Mallow (Abutilon theophrasti), a cosmopolitan adventive shrub in the Mallow family (Malvaceae), originally native to Central Asia and China. Other common names include Chinese Jute and Pie-marker. The latter name is a reference the distinctly shaped schizocarpic fruit, which could conceivably be used to make a decorative pattern in soft pastry dough.
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