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