<human>: Provide a brief overview of the text.

edit: The fence is ON the property line, backed by a survey.

Most of the homes in my area have 6' chain link fences around our back yards. By local custom, the 'nice' side faces the neighbor and the posts are on the fence owner's side.   
   
Such a fence divides my back yard from my neighbor's, and it is common knowledge among the people who have lived here a long time (15+ years) that the fence belongs to me. But there is no way to conclusively prove it. The 'nice' side faces my neighbor's house and it ends at the corner of my house, where a gate finishes it up, enclosing my back yard and isolating it from the front yard. Basically all signs point to it being mine.   
   
So, said neighbor has planted creeping viney plants that are bearing weight on and pushing against my fence. And I just discovered that he plans to put privacy slats in it.   
   
Basically, I don't care if the slats go in, but the potential color is an issue, as is the quality of his workmanship.    
   
I DO however care that his plants are beginning to push against the fence and what, if any, rights I'll be giving up if I simply ignore the issues for the time being.   
   
In an ideal world I would just talk to him, but this isn't an ideal world. He is a potentially violent gun toting drug user (I have no problem with guns, just the mental imbalance he has). He's alienated every neighbor within five houses on either side of him, and swears at me every time he sees me outside. I've been ignoring this for three years. And his mom actually owns the house, so I'll actually be dealing with her.
<bot>: Washington State, neighbor is messing with my fence. I have to call his mommy, does anyone know if the fence direction has any bearing on ownership in my state?