Echinacea, Echinacea augustifolia, UAE. Echinacea, Echinacea augustifolia. Close-up of flower head medicinal herb. The petals are useful for late colour in the flower border. They are drought-tolerant perennial plants growing to 1 or 2 m in height, found growing on the prairies where it was used by the native north americans. Boosts immune system and helps to fight colds. Colourful, pink flowers in a field.