If all of these benefits sound good to you, your next step is to learn how to safely and properly use lemongrass oil. First, you don't want to apply the oil directly to the scalp; be sure to dilute the oil first in some sort of carrier (per Verywell Health). 

As for your hair care, there are a couple of ways to integrate lemongrass oil into your routine. One method is to add roughly 10 drops of the oil to your shampoo or conditioner and let it do its thing while you wash your hair as usual. The shampoo and conditioner will act as a carrier, diluting the oil and making it safe for your skin, according to La Tourangelle.

Another good option is to use the oil to do a scalp massage. You can mix a few drops into your conditioner and massage it into your scalp that way, per Healthline; or, if you already have an oil like olive oil or coconut oil that you like to use on your scalp, you can mix the drops of the lemongrass oil into one of these oils — using it as a carrier — and massage as usual.