Found this growing in my bark pathway. Because of the pretty red stems, I potted it up to see if I could figure out what it might be. I have lots of Japanese maples in my yard, a couple sycamore maples, and tons of big leaf maples. This doesn't look like anything currently growing for me, so must have been planted by the birds. If I can figure out what it is and how big it will get, I may (or may not) keep it. Thanks.