Watermint is a member of the mint family, one that has been in use since the time of the Ancient Greeks. Some historians believe that watermint is the mint referred to in Greek myth of Menthe, the nymph who was turned into the mint plant by jealous Persephone. They also believe that it is watermint that is used by Philemon and Baucis to scrub tables as mentioned in the writings of Ovid. Both the Greeks and the Romans used members of the mint family as a part of the ritual for preparing dead bodies to be interred. It was used for its aroma, which helped to mask the smell of decay.
The use of watermint or pennyroyal to scent bath water was another practice common to both Ancient Greece and to Ancient Rome.
In the Middle Ages, watermint leaves were scattered on the floors of banquet halls as a kind of air freshener. As guests entered and moved around, the leaves would be trampled and release their fragrance.