Herbaceous Perennial: The showy dark purplish-blue petals with a beautiful white center look amazing in beds, borders, cottage gardens, and are even good for cut flowers. But they are toxic to humans and animals. Exp: full sun/ partial shade, no hot dry heat or high winds. Water: moderate/moist & well drained. Likes clay, sand, chalk as soils. Deer/rabbit resistant. Attracts hummingbirds & butterflies. Height: 2-4'. Width: 1-2. USDA Z3.