Traditionally blackberry leaf tea is used for a sore throat, sore gums (gingivitis) or mouth ulcers. The leaves are high in Vitamin C and hydrolysable tannins and flavonoids. The astringent qualities of the tannins help to tonify mucosa. For this reason it's also said to be useful for gastrointestinal inflammation and diarrhoea. For a mellow cup of tea 1 tsp of tea leaves per cup. Add 200ml of boiling water, steep for 10 mins. For a deeper flavour cup of tea. Boil the 200ml water in a pan add 1 tsp of tea leaves, cover and simmer for 2 mins. Steep for 15 mins. Drink hot or cold, naturally floral and lightly sweetened.