Facial toner: Rosemary hydrosol can be used as a spray on your face. This natural facial toner helps tighten and tone the skin, reduce the appearance of pores, and balance sebum production. Hair and scalp treatment: Rosemary promotes hair growth, reduces dandruff, and strengthens hair follicles. Use it as a hair and scalp treatment by spraying it on the scalp and leaving it on for a few hours.