Posted: 08/11/2012 at 07:16
Yep, without holes you'll have built a pond and it'll drown. What sort of bamboo have you got? If you get the non invasive clump forming ones, then no need to worry.
You can get root control bags for fruit trees:
http://www.readsnursery.co.uk/products/Root-control-bag.html
But don't know how effective they'd be for something more keen like a bamboo. Anyone?