I understand that this is probably my ignorance making me kind of an ass here, but my gut response is "obviously?".
They're pressure waves, literally forces acting directly on the plant! Imagine reporting that plants can grow differently if you grab them and yank them around a bit every once in a while.
I think it's interesting to contrast to vision/light: similarly, there is a physical effect which we can perceive "from a distance". But vision varies wildly even among animals, and there are plenty of wavelengths of light that we can't perceive. I enjoyed a brief discussion of this in Andy Weir's The Martian (no spoilers here).
