Quercus robur or quercus petraea, or oak, is a deciduous tree in the fagaceae family. Oak is generally found in woodlands and prefers clay soils.
The oak tree (in particular its bark) has been used medicinally for many centuries. It is anti-inflammatory, antiseptic, astringent, decongestant, haemostatic and tonic. A decoction can be used externally to bathe wounds, skin issues (such as acne), and sweaty feet. It can also be used as a gargle for sore throats. This deconction is made using bark from young trees (5 to 12 years old). Once the tannins have been leached from the seed it can be roasted and used as an almond substitute. It can also be used as a coffee substitute. A mulch of old oak leaves can also be used to repel slugs and grubs.