For the scalp, mix the powder with water into a looser, yogurt-like paste — thinner than what you would use on the face. Apply it directly to the scalp, parting your hair in sections so the paste reaches the roots, and massage gently with your fingertips for a minute or two. Leave it on for about 10–15 minutes, then rinse thoroughly with warm water. You may need to rinse twice to remove all the plant residue.
Tulsi works here as a cleansing herbal treatment rather than a rich conditioning mask. It helps remove light buildup from the scalp and leaves the roots feeling lighter, which can be useful when your scalp looks flaky or feels less fresh between washes. It is not meant to replace a conditioner — if your lengths need moisture, follow with your usual conditioner or a light oil on the ends only.
Once a week is a reasonable starting point. If you already use herbal hair powders or non-heavy styling products, Tulsi combines easily with that kind of routine. You can also add a few drops of your usual hair oil to the paste if your scalp feels very dry, though the mask itself is not formulated as a moisturizing treatment.