Mentha pulegium, commonly known as Pennyroyal, is a low-growing, aromatic perennial producing clusters of soft lilac-purple flowers arranged in rounded whorls along its stems. The small green leaves release a strong, distinctive mint fragrance when brushed or crushed.
A spreading, hardy perennial, Pennyroyal is particularly useful for damp borders, pond margins, wildlife gardens and naturalistic planting. It thrives in moisture-retentive soils, tolerates partial shade and gradually forms a fragrant carpet of foliage. Its summer flowers add delicate colour and texture to the garden.
Please note: Pennyroyal is toxic if ingested and should not be used for culinary purposes, herbal teas or home remedies.
When to Sow: Mar–May
HOW TO SOW:
Sow seeds thinly on the surface of moist, free-draining seed compost and gently press into the surface without covering, as light aids germination. Maintain a temperature of approximately 18–21°C and keep the compost consistently moist.
Once seedlings are large enough to handle, transplant into individual pots and grow on in a bright, sheltered position. Gradually harden off before planting outdoors after the risk of frost has passed.
Classification: Hardy Herbaceous Perennial
Expert Level: Easy to grow
Germination Time: 10–21 days
Flowering Time: Jul–Sep
Site: Full sun to partial shade
Soil Type: Moisture-retentive loam, clay or other fertile garden soils
Soil Acidity: Acidic, neutral or alkaline
Moisture: Prefers consistently moist soil and tolerates damp or poorly drained conditions.
Care: Water regularly during dry periods, particularly while establishing. Trim back after flowering to encourage fresh growth and maintain a compact habit. Plants spread through creeping stems and may require occasional division or containment.
Use: Ideal for damp borders, pond margins, wildlife gardens, ground cover and naturalistic planting. Particularly useful in moisture-retentive soils and areas with partial shade. Ornamental use only; toxic if ingested.
Height: Approximately 10–30cm.
Plant Spacing: 30cm