We live in the city, and my neighbor planted these all along the fence line. I'm concerned that the root system is invasive. There are sewer, and water lines near where she planted these god awful things. I'm also wondering if the root system is going to affect my plants on the other side of the fence. I've searched all over the internet, but can't find anything on whether these things have invasive root systems.
Sorry this one has gone unanswered so long! Willow roots can be very damaging to older clay pipe sewage systems, if there are any leaks in the pipes, the roots will get into them and end up blocking the pipe. But modern plastic or metal pipes with no leaks are secure, the roots can't get into them. The roots are unlikely to have a significant effect on other plants.
