I have search and I haven't seen this suggestion.
It would be great for a whimsical achievement, that after a number of cherries eaten you received the a "Witches of Eastwick" achievement. An extension to this could also be the randomness that after a certain number you vomit up cheery stones, so that you can plant a tree, or indeed it plants one automatically.
For those who don't know, the witches in the film make Jack Nicholson vomit up the stones from the cherries they are eating. Classic film scene.