Posted: 21/02/2016 at 16:01
In pots, on a windy, shaded balcony isn't really the ideal place for bamboo.
I'd choose a different plant altogether if you want a screen of some kind Steve. It looks like they have very little light too. Although bamboo can be invasive in the wrong place in the ground, it's not too rarely happy in pots. Not sure they appreciate always being damp either - they need decent drainage.
Sorry if that's a bit negative!