Perennial. Valerian is highly prized as a medicinal herb. Low growing with delicate fern like foliage gives way to 4-foot clusters of pale pink flowers June-September. Very attractive in herb gardens. Valerian is used to soothe anxiety, relieve pain, and calm minds that cannot fall asleep. Height: 1.5-2.5'. Exposure: sun/part shade. Water: mod-moist. USDA Z 3-9.