Rosemary has been used in herbal and traditional medicines for thousands of years for its numerous healing properties. According to author Cox, one of these properties is the ability to promote hair growth. Rosemary can be used in herb or essential oil form to help stimulate the hair follicles. When used in herb form, dried rosemary can be combined with olive oil and heated gently in the microwave or on the stove top to make a hair growth tonic. Both the tonic and the essential oil can be massaged into the scalp to help encourage faster hair growth.