Whole leaf. Soothing and sedative, which in turn gives it appetizing and digestive properties. Healing when used externally. Recommended method of use for infusions: Pour the contents of a tablespoon into boiling water and remove from heat. Cover the container and let it sit for 8 to 10 minutes. If they are roots, bark or seeds, simmer for 2 to 4 minutes. Strain and sweeten to taste.