Most consider it a weed, and it is invasive and forms these thick mats of prickly roots. All that aside, it grows a lot on my property and I let it because when it flowers the air is scented with the scent of orris root,or violets. I also love the way it looks...very tenacious, but looks so delicate.
edited to add that I don't know if it will trail down for you. It's natural inclination is to go straight up and it will most likely climb whatever it is hanging from......
