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Since 1992 the International Oak Society has been bringing together oak enthusiasts from around the world. Born from a shared desire to exchange Quercus seed, the IOS has grown in many directions. Our mission: to further the study, sustainable management, preservation, appreciation and dissemination of knowledge about the genus Quercus and its ecosystems.

To join the IOS, you first need to subscribe to The Cupule, our free e-bulletin, by clicking on the button below. Then log in using the username and password you created and you will find instructions to join the IOS on the home page.

To read about membership rates and benefits, click on "Learn More" below.

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Editor's Picks

Oaks in Oz: Australian Oak Open Days, May 8–13, 2025

Oak collections and much more in Canberra, New South Wales...

Website Editor | Aug 11, 2025

Nay! Its Née, not Neé

A controversial publication proposes to change the...

Roderick Cameron | Aug 05, 2025

Group photo with champion Quercus arkansana in Bokrijk Arboretum

Belgian Oak Open Days: May 29–June 1, 2025

A team of reporters share their take on the event.

Website Editor | Jun 22, 2025

Plant Focus

Quercus ×bimundorum ‘Crimschmidt’ growing in the Prairie Arboretum, Freeman, South Dakota, USA © Dirk GiseburtQuercus ×bimundorum ‘Crimschmidt’ growing in the Prairie Arboretum, Freeman, South Dakota, USA © Dirk Giseburt

Hybrid Highlight: Quercus ×bimundorum E.J. Palmer, the ‘Oak of Two Worlds’

A naturally occurring hybrid between Quercus robur and Q. alba.

Latest Articles

Israel Oak Association Conference at Ramat Hanadiv

The IOA's 3rd Conference was held on July 3, 2025.

Photo from a drone, September 2024 © City of Tumwater - Courtesy Save the Davis-Meeker Garry Oak

Turbulence in Tumwater: The Davis-Meeker Garry Oak

A historic Quercus garryana is the cause of unrest in Tumwater, Washington State, USA.

Sad News from England

The Major Oak of Sherwood Forest in Nottinghamshire appears to be close to death.

Latest Blog Posts

Fourth Triennial Silent Auction: Items Needed

Support the IOS by donating items for the Silent Auction.

The X-Files: the Mystery of Quercus ×munzii

A highly entertaining podcast focusing on a rare Californian oak hybrid.

Cattle Cashing in on Acorns in Argentina

Cows caught munching Quercus robur acorns

Acorns Cached in Cork in California

It is not every day one would expect to find acorns stuck in the bark of a cork oak (Quercus suber).

Temporal Dynamics in Acorn Production by Quercus robur in Southeast England

I am carrying out a long-term study of the ecology of Quercus robur, including insect herbivore impacts on girth increment.

Upcoming Events

Oak root grafting and disease transmission across taxonomic section boundaries

In 2008 one red oak hybrid (Quercus rubra × ellipsoidalis) was diagnosed with oak wilt disease (Ceratocystis fagacearum) at Starhill Forest Arboretum in Illinois. The tree was removed to below grade...

9490 Kilometres Across Mexico, Sep.-Oct. 2010

After several months preparation – consisting mainly of searching for any and all information about where to find about 40 oak species in northern Mexico and planning a feasible itinerary for a...

Royal Botanic Gardens Kew

Shaun Haddock invited the IOS membership on July 19, 2010 to an Oak Open Day at the Royal Botanic Gardens, Kew, near London. The aim was to focus on the Mexican oak species in their vast oak...

A new species of oak, Quercus delgadoana

An oak in cultivation as Quercus eugeniifolia has now been described as a new species (Novon June 2011). Quercus delgadoana S. Valencia, Nixon & L. M. Kelly (Fagaceae), a new species from the...

Arboretum des Grandes Bruyères

The Oaks of l’Arboretum des Grandes Bruyères Oaks are the main genus in the Orléans forest. The inventory of French national forests shows that 62% of the trees in140,000 acres of forest are oaks...

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Supporting Institutional Members