Ok, this stuff was in the backyard when my parents moved in 20 years ago. Then it was ALL OVER the yard, like a scourge. The neighbors said it was Bamboo. The stalks LOOK like BAMBOO. Over the years dad dug it up, burned it, bleached it, you name it, and over the course of 20 years my dad has gotten it to a place where he can manage it. ( Edit to say that we know have educated ourselves on the proper management of "running" bamboo but now we're told this isnt bamboo). It appears to have "Rhizomes" like bamboo. It shoots in the spring, the shoots come up out the ground in thick pointy arrows, it looks just like bamboo. I wish I had pictures. The shoots grow VERY quickly, from May to say, June 1'st it will go from shoot to 15 feet tall. Over the course of the summer it grows to about 15 feet, maybe 20 feet. In the late summer it has pink lacy blooms of some sort. Bloom isn't probably even the best descriptor but it's all I think to use to describe it. In the winter the stalks turn brown, it all dies back and just looks like thick brown brittle stalks. It returns EVERY year like clockwork. There is very little you can do to keep it from coming back. I dug some of it up and threw it on a concrete area and it managed to sprout this spring. We visited a bamboo grower in Ohio a few months ago so I took a stalk of this with me to ask what sort of Bamboo it was. He said it WAS NOT Bamboo, but he didn't know what it was. So.....for 20 years we have thought we were dealing with BAMBOO. If it's not BAMBOO, what is it? I have a picture of the entire stand which is about 14 feet long and 10-15 feet high, to give an idea of it's size and how it looks, however the picture seems to be corrupted and is too large to host. So here are some smaller pictures of "interior" shots of the stand. It looks just like Bamboo in as much as the stand is large, tall and thick and looks dense, however if you walk through the lush leaves the " inside" is very open and is a forest of stalks. My parents dogs like to sleep and play inside the cool "forest".