I have about fifteen acres or so, all of which used to be mowed twice a year when this was my grandparents' active farm. Then, when they passed on, it was still mowed once, maybe twice per year for a while. But, we haven't had it mowed in about eight years now. I really don't know one grass or hay type from another, but it's green and gets really tall every summer, then withers and browns every winter. There are some small, thin bushes that have started here and there, but nothing that could not easily be dug up or hogged over.
I mow about five acres or so to have as a manicured area that looks decent and allows me to walk around and enjoy the land. Part of the reason I stopped mowing the rest is because as soon as it was cut, everyone in the area figured the space had just opened up as their personal golf/frisbee/baseball/hiking playground. I get so darn angry when people use things of mine without my permission, that I decided to put the kibosh on it as best as I could, without having money to run a fence around the whole place.