Bamboo varieties in the past were horrendously spreading invasive monsters. Like it or not if you had a bamboo in your garden 20 years ago shortly after all your neighbours had bamboo too. The newer varieties of Phyllostachys and Fargesia are clump forming and much easier to control and contain.
But saying that peace of mind is a wonderful thing and if you are at all concerned about unwanted spread consider using our root barrier which will safeguard you from any unwanted spread. If your not sure if you need root barrier or not sure how to use it give us a ring and we can chat through the best options.