Pennyroyal plant is a perennial herb that was once widely used but is not as common today. It has applications as an herbal remedy, culinary uses and as a decorative touch. Growing pennyroyal in the herb or perennial garden will add color with its reddish purple to lilac blooms. There are two plants called pennyroyal. One is the European pennyroyal (Mentha pulegium), which is a member of the mint family. The other is the American pennyroyal from an unrelated genus, Hedeoma pulegoides.
Invasive in wetlands regions.