where are you located? I live in eastern mi, and harvest my own. I have a lot of grape vine? (I dont know why everybody calls it that, it doesnt produce grapes) Part of the year I work in the woods cutting trees, and find 4inch vines on almost a dayly basis, 6" isnt totally uncommon. I have it in 9 of my tanks and love it. It holds moisture well which grows moss great. I just stick it in the great stuff before it cures. It seems that there is nothing that you can do to stop it from growing though. I have had pieces cut for almost a year and it started growing again after about 2 months. It grows fast, and can cut off the lights from the other plants, so it requires pruning regularly, but I like it. it makes for a constant evolving tank. if interested, I can send you pics. let me know where you live, and if interested, maybe I can send you some.