Blackberry

The root-bark and the leaves are strongly astringent, depurative, diuretic, tonic and vulnerary. They make an excellent remedy for dysentery, diarrhoea, haemorrhoids, cystitis etc, the root is the more astringent. Externally, they are used as a gargle to treat sore throats, mouth ulcers and gum inflammations. A decoction of the leaves is useful as a gargle in treating thrush and also makes a good general mouthwash. Source: https://pfaf.org/