User blog comment:Relikz/Chapter 364: Tartarus Arc, Part 1: Immorality and Sinners, Review./@comment-7418318-20131220001936/@comment-173.79.102.70-20131221231701

I take it you didn't read the translators note on this page?

http://readms.com/r/fairy_tail/364/2184/6

Here, I'll transcribe it:

"T/N: The "Apple of the Earth" (Perhaps better known as the "Pomme de Terre") is actually the potato. This appears to be some kind of comment on this guy's gardening skills."

So yes, MS's translator certainly did say something about potatoes.