Electrodes for "Plant Singing" Sonic Arts

Hi!
I'm looking for the best electrodes, compatible with Arduino, to make something like this
for my Master's Degree thesis:

or this https://www.youtube.com/watch?v=VvWPT4VhKTk

In fact it would be a matter of measuring the capacitive variations of the plant and sending the signal being processed to max / msp or similar.

Has anyone already had similar experiences?
I have found electrodes for ECG and muscle measurements for humans, can they be okay?

( for example https://www.ebay.it/itm/Kit-modulo-ecg-AD8232-per-elettrocardiogramma-cardiofrequenzimetro-arduino-1774-/312293403278 )

Thanks a lot to everyone has good advices.