Bamboo, and similar species, grow by their roots spreading out and they will grow anywhere and take over. The only way to prevent the spreading is to contain the root system. It is a very fast growing plant which is why it is considered green.
I am a progreen/organic consumer, but obviously am very naive as I didn't even think what had to be done to the bamboo in order for it to become a fiber!
I bought a package of it and have being wanting to use it. Now I will have to research it. I DO NOT want more chemicals in us or our environment.
BTW-any time you use a natural batting (cotton, wool, etc) wet and dry it first or it will shrink when you wash and dry your project. I personal love the puckering effect it give to quilts but that's just me.
Thanks for the heads up.