maintaining beyond your property line
I am new to these forums, so I wasn't sure which topic to post under.
I have recently purchased my deceased grandparents house from my family.
At the back edge of my yard, the ground starts to slope downhill for about 15 feet then becomes a tree line of woods about 30 feet deep until the person in the next neighborhood over's yard starts.
My grandparents lived here since 1950 and I moved in in 2010. For the sixty years my grandparents have lived here, they have always maintained the grass and plants to the back woodsline. I never once thought that my property didn't extend to the woodsline until recently when my mother told me that the property line is actually 15 feet before the woods lines right before the yard starts sloping downhill.
The person who my mother said that owns that section of land has never been up in that section next to my yard, for it is impossible to get to through the thick patch of woods. He or She also has never maintained that section (cutting the grass, trimming bushes, etc)
My concern is that I was planning on building a firepit in that area with a small patio. If I decide to not build it and stop maintaining that area, it will definately get overgrown and be an eye sore.
Is there any type of law that states if you maintain adjacent property to yours that the actual owner does not after so many years that it becomes yours? I have always heard something about this but could never find anything in writing.
Thank you for your replies,