Asian/agent (I've seen it both ways) orange is supposed to be an herbicide, and a very powerfull one at that. Powerfull enough to wipe out just about any living thing given direct application over the course of a few hours, or at the very least a nasty slew of skin disorders lasting the remainder of your life.

The "huge wildlands" isn't THAT huge (it's only about 8'x50' last I looked), and was an old staging area used by the previous owner of the house, so it's full of untrimmed bushes which were never replanted in time, thistles, really fat ugly crickets and (you guessed it!) tall grass. It's also really ungraded with big mounds of dirt everywhere so you won't want to put any tent back there.