What frequency ranges are needed to be able to hear this stuff? I would love to mess around with this using my tomato plants and a rasp pi or something just to see if I can hear anything when they get dry.
I think plant emissions are up in the like 40-80khz range? You can get consumer specialty mics that go up into the 50s for sure, but I'm not super well-versed on the capture options in that freq range.