to include an obviously inappropriate clue because it has the
same number of letters as the proffered clue)
(I got it though 4 letters starting with a t, but yea)
For all the germanic languages, the word ultimately comes from latin "moneta"
So nothing to do with the plant. The term in mint condition does come from mint as in place where coins are made. When they have been freshly stamped in the mint, they are in mint condition.
Iowa is also a four letter state in the US.