Lemongrass, also called citronella, is a tall, stalky plant. It has a fresh, lemony aroma and a citrus flavour. It’s a common ingredient in Thaicooking. Lemongrass essential oil is used in aromatherapy to freshen the air, reduce stress, and uplift the mood. It is also used as a folk remedy to promote sleep, relieve pain, and boost immunity. One of the most popular ways to enjoy lemongrass is tea.