Tough spreading groundcover. Of the mint family it has small greyish green leaves with clusters of flowers ranging from reddish purple to lilac blue. Excellent companion plant.
Shady position and constantanly moist soil.
Enjoys regular application of fertiliser
Combine half a cup of Pennyroyal with one cup of vegetable oil, bottle and store for a day in a warm spot. Spray on ant trails and around dog kennels to repel fleas.