Ajuga is a genus of around 64 annual and perennial herbaceous plants, within the mint family of Lamiaceae. Featuring evergreen and semi-evergreen species, this spreading genus can handle both sun and shade. It grows vigoriously in moist conditions from rhizomes and runners and is fully hardy, thus makes brilliant ground cover. The blue flowers are double-lipped, tubular and grow up to 40cm in whorls during spring and summer.