Perennial Herb or Subshrub: Sturdy growth with a semi-trailing habit and extra-large double white flowers gives it adaptability to a wide range of climate conditions. A great sub for white alyssum. Good for pots, baskets, beds or as a ground cover. Grow in sun to part shade. Provide ample water in full sun but avoid overwatering in shade. Size: 4-6" x 12-24". USDA Z9.