In my calculus class in high school, one of the problems in the set at the end of the chapter about the rate of the growth of kudzu. None of us had heard of it (including the teacher), which I guess might be due to being in New England rather than somewhere it's more of a problem. I think I remember us thinking it was some sort of crop rather than a weed, so we were all very surprised at the super high rate of growth it used in the problem.