well i would assume so otherwise its gonna leach sap and general plant juices, oh wait, no, i just had a look at my bamboo outside and when it big and thick it usually doesnt have that much moisture, and it will stay green so that shouldnt be a problem, just make sure that its not too juicy, you can probably judge it for yourself, the stuff i used was dead when i put it in my tank. but anyway, it looks really cool so have fun, you can also carve patterns onto the surface with a sharp knife of chisel which looks even cooler!