Let your garden sparkle with Achillea ptarmica Diadem! This snow white beauty produces a mass of pompon-shaped flowers in summer. Diadem has a neat, rounded shape and a compact height of 12” tall. When you lightly prune the plant, it will rebloom. Diadem is very winter hardy to USDA Zone 4a. Ideal for containers, flower borders, and as a groundcover. Plant in average well-drained soil in sun or partial shade. Bees and butterflies love this outstanding new perennial.