Autumn is prime-time for planting, (not just bamboo but many trees and shrubs). This is because you have the great combination of warm soil and moist soil. This means plants establish quicker and need less help from you doing so.
This nice little planting window will last to mid-November normally so there is still time to be busy in the garden. We have some lovely bamboo plants for sale through Autumn and as always if you're not sure what to put where please do get in touch.