Native to southern Europe, hyssop has long been employed as a medicinal, culinary and sacred herb. Mentioned in the Bible for its cleansing properties, hyssop is used medicinally as an expectorant, diaphoretic, carminative and stimulant. Cut the fresh flowering tops for an herbal infusion to battle coughs, colds, poor circulation, and flatulence. Moderately drought tolerant, hyssop is a fantastic landscaping choice. It is evergreen, very cold hardy and shrubby to 3 feet. Perennial.