Pennyroyal was commonly used as a cooking herb by the Greeks and Romans. The ancient Greeks often flavoured their wine with pennyroyal. Pennyroyal is used to make herbal teas, which are reputed as safe to ingest in restricted quantities. The fresh or dried leaves of pennyroyal have also been used when treating colds, influenza, abdominal cramps, and to induce sweating, as well as in the treatment of diseases such as smallpox and tuberculosis, and in promoting latent menstruation. Pennyroyal leaves, both fresh and dried, are especially noted for repelling insects. However, when treating infestations such as fleas, using the plant's essential oil should be avoided due to its toxicity to both humans and animals, even at extremely low levels. Pennyroyal makes a superb low-growing ground cover, because it is both very hardy and very ornamental. Requires little to no maintenance. Perfect for rock gardens with its tiny bright lime-green foliage that forms a dense mat that works well between stones.
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