It's frustrating to put time and effort into curating a healthy, balanced yard only to discover that a neighbor is cultivating an invasive species next door. If the plant is located in your neighbor's yard, you might feel unsure about how to respond without creating unnecessary conflict. You can mention that you notice the plant growing near your property line and express concern about the potential for spread. If they're receptive, you might even suggest cooperative solutions, such as installing root barriers, trimming the plant regularly, or replacing it with a less aggressive, potentially native alternative. Your neighbors might even be willing to work with you once they discover that the invasive species is causing long-term damage to surrounding properties, and their own yards.