Stachys byzantina (Lamb's-Ears) - A low-growing groundcover that forms a dense carpet of white-woolly pointed leaves spreading to 4 to 5 feet wide. Whorls of purplish-pink flowers appear in summer on 1 to 2 foot tall spike with a few reduced leaves. Plant in sun or part shade with little to occasional irrigation. Tolerates most types of soils but dislikes humidity. Hardy to USDA Zone 4 (-30 °F). A great plant for borders, mixed with succulents or in a rock garden. The flowers are useful and last a long time in arrangements.