Oak Durmast

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  • Botanical: Quercus petraea
  • Family: Fagaceae
  • Hits: 3736
Oak Durmast


Quercus petraea



Known as

Sessile oak, Cornish oak, Durmast oak

Old Use


Collection Times

September to October

Parts Used

bark, seed




antiseptic, athlete's foot, boils, bleeding, burns, cystitis, diabetes, diarrhea, eczema, gastritis, hemorrhoids, infections intestinal, sore throat, ulcers, varicose veins, wounds, frostbite, stomatitis

Infection & Inflammation


Respiratory System



antibacterial, anti inflammatory, astringent, tonic


The sessile oak is a large deciduous tree up to 20–40 m (66–131 ft) tall, in the white oak section of the genus (Quercus sect. Quercus) and similar to the Pedunculate oak, Q. robur, with which it overlaps extensively in range. The leaves are 7–14 cm (2.8–5.5 in) long and 4–8 cm broad, evenly lobed with five to six lobes on each side, and a 1 cm petiole. The flowers are catkins, produced in the spring. The fruit is an acorn 2–3 cm long and 1–2 cm broad, which matures in about six months.

Properties & Uses

A mulch of the leaves repels slugs, grubs etc, though fresh leaves should not be used as these can inhibit plant growth. Oak galls are excrescences that are sometimes produced in great numbers on the tree and are caused by the activity of the larvae of different insects. The insects live inside these galls, obtaining their nutrient therein. When the insect pupates and leaves, the gall can be used as a rich source of tannin, that can also be used as a dyestuff. The bark is an ingredient of 'Quick Return' herbal compost activator. This is a dried and powdered mixture of several herbs that can be added to a compost heap in order to speed up bacterial activity and thus shorten the time needed to make the compost. The bark is very rich in calcium. An ink is made from the oak galls, mixed with salts of iron. The wood is a source of tar, quaiacol, acetic acid, creosote and tannin. Tannin is extracted commercially from the bark and is also found in the leaves. Wood - hard, tough, durable even under water. It is highly valued for furniture, construction etc. It is also a good fuel and charcoal. Trees can be coppiced to provide material for basket making, fuel, construction etc.

Traditional Use

The oak tree has a long history of medicinal use. It is anti-inflammatory, antiseptic, astringent, decongestant, haemostatic and tonic. The bark is the part of the plant that is most commonly used, though other parts such as the galls, seeds and seed cups are also sometimes used. A decoction of the bark is useful in the treatment of chronic diarrhoea, dysentery, intermittent fevers, haemorrhages etc. Externally, it is used to bathe wounds, skin eruptions, sweaty feet, piles etc. It is also used as a vaginal douche for genital inflammations and discharge, and also as a wash for throat and mouth infections. The bark is harvested from branches 5 - 12 years old, and is dried for later use. Any galls produced on the tree are strongly astringent and can be used in the treatment of haemorrhages, chronic diarrhoea, dysentery etc. The plant is used in Bach flower remedies - the keywords for prescribing it are 'Despondency', 'Despair, but never ceasing effort'. A homeopathic remedy is made from the bark. It is used in the treatment of disorders of the spleen and gall bladder


None known


Europe, including Britain, from Norway south and east to Spain, S.W. Russia and Greece.


Tannin, tannic acid, tannins, bitter substances, gallic acid, Quercin, quercetin

For educational purposes only This information has not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.

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