Have you talked with your neighbor and told them their bamboo is spreading to your property? You can dig down along the edge of your property a few inches, taking care to cut through and destroy any rhizomes that have spread to your area, and then install plastic rhizome barrier across the top six inches of soil to prevent it from spreading into your area. Rhizomes usually exist in the top few (less than six) inches of soil. If you are on good terms with your neighbor, they may agree to install it on their side of the fence.

There are many bamboo species and without a photo it is impossible to know what they planted. If it is golden bamboo, it is invasive. Roundup Original will usually take care of it, but it may need to be reapplied. You can also kill it over the long term (up to two or three years) by repeatedly mowing over the young shoots.