It's also a nice home for mice. Unfortunately the mice population tends to grow large enough that they look for new homes. Your home and your neighbor's homes

It's also a nice home for mice. Unfortunately the mice population tends to grow large enough that they look for new homes. Your home and your neighbor's homes start to look very enticing and pretty soon you're hearing chewing the walls and power sockets stop working randomly. One of my neighbors let their backyard run wild like that and a couple of years later exterminator trucks were a common sight in the driveways.