Photo: Mentha x piperita.

Flowering plants. Beware of anybody trying to sell peppermint seeds - they don't have a clue. Peppermint is a hybrid of M. spicata and M. aquatica. Any seeds from the flowers will give you one of the parent species. Annala, Helsinki, Finland. Planted. 1999-07-31.
Mentha x piperita L. Engl.: peppermint, black peppermint, chocolate mint. Deu.: Pfefferminze. Suom.: piparminttu. Sven.: pepparmynta. Fran.: menthe poivrée. Ital.: menta. Bot. syn.: See Mentha aquatica L. x spicata L.., Mentha dumetorum Schultes
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Photo: Mentha x piperita.