Black/golden bamboo in a pot
I want to grow bamboo in containers either side of my patio next to the fence to provide some privacy. I was hoping for rectangular containers so they can be pushed right against it and grow along it. Whilst looking at them this morning, the golden bamboo said it grows to 6m tall and 6m wide! Is that correct? I assume it will just grow to whatever the length of the container. Can you cut bamboo at the top to stop it growing so tall or should I go for the black bamboo instead, which said it only grows to 4m? They are currently in round pots. Will that spread out all along a rectangular container or would I need to seperate the shoots out and plant them along it? Sorry if that is a stupid question, I am very much a beginner!