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Mix 1/4 cup of tea with 1 cup of liquid castile soap.  Add a few drops of camphor oil immediately before you shampoo if you have dandruff. Squeeze in a small amount of lemon juice for oily hair. A few drops of lavender essential oil creates a soothing fragrance. Pour the liquid slowly through your hair immediately after you shampoo, and then rinse your hair with warm water. Dip a cotton ball into the tonic, and then dab the tonic onto your scalp. Put on a plastic shower cap and leave the tonic on your scalp for 30 minutes, and then rinse.

Summary:
Use rosemary tea to make basic rosemary shampoo. Add 1/2 cup of warm water to 1/2 cup of rosemary tea to make refreshing rosemary hair rinse. Add 2 to 3 drops of camphor oil to a cup of rosemary tea, then use the mixture as a tonic for dandruff or itchy scalp.