Hidden expenses of an oversized lot

[Hedy Kromer]

I'm in contract on a house in Atlanta (Stone Mountain).  I just noticed that the lot size is listed as .6 acre (25,000 sf), which is huge.  I looked at how it's parceled, and it has a regular sized back yard with backs into a richly forested area, which I had assumed was owned by the city/park.  However, it turns out, I would own it.  So my concern is, are there hidden expenses that I should be concerned about with owning so much land.  It's a forest, so I wouldn't do any landscaping to it.  But my concern is that the city may require that I do some sort of weed abatement every year or so.  Does anyone have any experience with this?  I'm hoping that there likely wouldn't be any additional expenses of owning that forest, although there's no guarantee.  But what's the likelihood?