Whether you opt for rosemary water or rosemary oil, you’ll get the growth benefits. The difference is simply what base the rosemary is in—oil, or water. Those with a dry scalp will benefit more from rosemary oil, while those prone to greasy roots may like rosemary water more. 

If you want a leave-in treatment, rosemary water is more practical. For those who want to treat their scalp and wash it out a few hours later, choose the oil route.

Anyone planning to massage their scalp may want to pick rosemary oil, as the slippery consistency is better fit for a massage.

You can even incorporate both into your routine—using rosemary oil as a rinse-out treatment and rosemary water as a leave-in treatment.