Yes, I meant the plant itself. According to different internet articles, the mints will take on the flavor of their neighbors. Pollination non necessary. I have not tried it to see how true, or how close the plants need to be.
The only thing I have done is plant peppers too close together. I had heard you should not do that, but I didn't care, partly because I kind of didnt believe the flavor of the pepper could change just by being near another variety, and party to see if it were true.
Sweet varieties that I had successfully grown before to be sweet were spicy! Not as spicy as their jalepeno and cayenne neighbors, but definitely had a kick!
Interesting stuff! Im sure there is some deep-down biological reason for it all, but I do not know what it is!