Hardy perennial favourite in cottage gardens. It grows to about 2ft height in most soils and puts out attractive spikes of purple flowers Used for drying and in pot pourri.
Once extensively used medicinally (but do not use without professional supervision). Gerard reckons it good against falling sickness, sciatica and the bites of snakes and mad dogs.
Gerard: ‘A decoction made with mead and Pennyroyal is good for putrid agues.