Pennyroyal - Mentha pulegium


Mentha pulegium produces whorls of axillary lilac-mauve flowers. Corollas are hairy on the outside, four-lobed and have four protruding stamens.  Calyx tubes have 2 lower teeth that are longer and narrower than the 3 upper teeth. The elliptic-ovate yellow-green opposite leaves are strongly channelled, have a few very small teeth. They are dotted with glands containing a strongly mint-scented oil. The stems root at the nodes and have fine, downy hairs.

Identification difficulty
Recording advice

Good photographs required and a specimen may be necessary.


Typically found in damp grassland overlying silt or clay.

When to see it

In flower during August, September and October.

Life History


UK Status

Rare as a true native plant in Britain, but garden escapes and introductions cloud the true picture.

VC55 Status

Rarely recorded in Leicestershire and Rutland where most records are probably introductions.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map