Growing bamboo in an outdoor plant box is possible without it spreading uncontrollably, but it requires careful planning and the right techniques. Bamboo is known for its aggressive growth, but by choosing clumping bamboo varieties instead of running types, you can significantly reduce the risk of unwanted spread.

To further ensure containment, use a sturdy plant box with solid barriers, such as thick plastic or metal, to prevent rhizomes from escaping. Regularly inspect the edges of the box and prune any overgrowth. Additionally, planting bamboo in a raised planter or using root barriers can help keep it under control.

Proper maintenance, including frequent trimming and monitoring, will keep your bamboo healthy while preventing it from invading other areas of your garden. With these strategies, you can enjoy the beauty of bamboo without worrying about it taking over your outdoor space.