The effects are cumulative, so extended use over time will create a more vibrant red. The easiest thing is to make it part of your hair care routine if you want continual red hair.

2 cups of water

1/2 cup of calendula flowers or fresh marigold petals from your garden

2 tablespoons of hibiscus petals

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Boil the water and simmer with the calendula/marigold and hibiscus for at least half an hour. Strain off the flowers and store in the fridge.

Use as a final hair rinse at the end of each shower.

Dry hair in the sun if possible.

Repeat daily until desired shade is maintained and then every few days to maintain.