Just popped up the other day and is growing incredibly fast! Almost looks like bamboo but is different especially since there’s a small bamboo seedling right next to it for reference please help!
while it looks like bamboo, your plant is actually a rather woody vine called Smilax or greenbrier. They usually have small spines all over them. Yours doesn’t seem to, but I still cannot tell what species it is until I see some mature leaves. I personally don’t like these plants because they are hard to dig and can spread. Feel free to resubmit pictures of the leaves later and I’ll give it another shot.
Dr. Steven Hill, Botanist, SCNPS