i actually did research on this ! plants grow favorably toward certain frequencies ! a study was done on corn where frequencies were played from 0-900 Hz , and the plants’ roots grew towards hz under 500 !!! this is relatively generalizable , and the human voice frequency is ~100 - 250 hz , so along with cardon dioxide from us, our voices are soothing to them and promote growth :)
It’s not so much the words, but the frequency at which one speaks. A “nice” voice is generally higher frequency than one used for insulting. Plants seem to like higher frequency sound, but lower frequency sound also won’t hurt their growth. So, if you’re a woman, feel free to cuss your plants out for being problem children. It would probably be as helpful to their growth as a man saying nice things to them.