Quote Originally Posted by LKPike
planting it next to their fence that faces woods, instead of next to ours.
Like others have mentioned pi grows fast & spreads all over. If you plant it near you at all it will come into your yard.

If they throw things in that area then they probably don't step there do they? So what good would PI or a pricker bush do anyways?

I'd just report them. Dumping is illegal.