A rare species native to central Asia circa 1830, rabbit-, rodent- and deer-resistant A. caesium has gorgeous, pale sky-blue globes. Each 4"-wide globe is comprised of dozens of florets accented with variable indigo-blue midveins, indigo-blue anthers and paler, almost white, centers. Its long-lasting flowers mature to a more lavender-gray color in the garden and the vase after weeks of bloom.