Lemongrass is a perennial herb that thrives in the tropics and subtropics. Thai Lemongrass is known as ta khrai. It also to treat nausea , stomach pain, and vomiting. Among hill tribe people in Thailand, it is used topically for sprains, bruises and sore muscle. As an aromatherapy oil, lemongrass is useful for treating headaches , and it works very well as an insect repellent. And it boosts circulation and speeds healing.