Proper Black Bamboo - Phyllostachys Nigra, and other Phyllostachys variants are clump forming, so I wouldn't class them as invasive - that's more the ones that send out really vigorous runners. I have two "walls" of Phyllostachys, one black & one with the green flash on the stem & they grow well once established, but you can control any runners just by pulling it up and back towards the plant- it stops that root growing but doesn't affect the rest of the plant.