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Habitat and appearance: This is often called garden mint and, although a common garden plant, it is not native to Britain but to the Mediterranean region. It has creeping stock roots and erect, square stems (reaching approximately 60cm high), bearing pointed, lance-shaped, slightly wrinkled, mid-green leaves. It has tiny flowers forming dense clusters, being pinky-purple and appearing mid-summer.
Garden suitability: Mints in the garden are there at the owner’s risk. All spread rapidly, especially if given a slightly moist or even damp-wet situation, although pennyroyal is a little less rampant. To keep the plant in check, plant either in a sunken bucket or behind a small retaining brick wall – well away from other plants, which it will swallow up.