I don't know how accurate this is or was....it's been 4 years and when I went to look it up saw a bunch of different links saying it's not all what they say. I only looked at one link...this one https://alexrhowe.com/2013/12/16/no-wi-fi-does-not-hurt-plants-or-anything-else-for-that-matter/ But there are others.
It's one of those things that is easy to believe because it seems like there should be a problem with WiFi signals, just as it seems like there should be a problem living beneath a mass of electric power transformers, and it's easy to believe that there might be cancer risks associated with holding a cell phone to your head for long periods of time.
I guess but I don't see anyone giving it up...I never put the phone to my ear though, not because of any risk...I just like speaker phone better.