FlexSlideshowBlock

11th IOS Conference Held in Oaxaca
Nikola Šušić shares his take on the event that took place in Mexico from October 5 to 8
Read more
Species Spotlight: Quercus vulcanica
Elif Deniz Ülker shares a detailed and personal account of this endemic Turkish oak
Read more
Hybrid Highlight: Quercus ×benderi
James MacEwen and Steve Potter delve into a hybrid oak with surprising fall color
Read more
Donate to Conserve Oaks!
In response to the overwhelming support of oak research and conservation expressed by our members, the IOS launched its Oak Conservation and Research Fund
Read more

Join the IOS today!

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.

Subscribe to our free e-bulletin

Editor's Picks

Group photo at Tregrehan

UK Oak Open Days 2025: Caerhays and Tregrehan

Visits to two gardens with collections of oaks and other...

Stephen Wood | Oct 27, 2025

Special Service Award plaque

IOS Service Awards Presented at the 11th IOS Conference

Plaques presented during the Gala Dinner in Oaxaca

Roderick Cameron | Oct 26, 2025

Group photo at Oaxaca Conference

The 11th IOS Oak Conference in Oaxaca

140 participants from 20 countries attended the Triennial...

Nikola Šušić | Oct 25, 2025

Plant Focus

Quercus vulcanica acorn and leaves

Species Spotlight: Quercus vulcanica Boiss. & Heldr. ex Kotschy

An oak endemic to Turkey

Read more

Home

Latest Articles

See More >

Read more

Barrels at Tonnelerie Nadalié, France

Another Gift From Oaks

Oak barrels are used to age wine and spirits

Read more

Quercus ×benderi at Kew

Hybrid Highlight: Quercus ×benderi and the Autumnal Mystery

A hybrid with surprising fall color

Read more

Israel Oak Association conference

Israel Oak Association Conference at Ramat Hanadiv

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

Latest Blog Posts

See More >

Silent Auction in Oaxaca

Oaxaca Silent Auction Results

Over U$S 2,000 raised for student scholarships

Prof. Chen with the Special Service Award

Prof. Yueh-Fong Chen Thanks IOS for Special Service Award

After receiving his Special Service Award from the IOS, Prof.

Driven Round the Bend by Bender's Oak at Kew

Steve Potter recounts a frustrated yet rewarding hunt for the hybrid

Silent auction at Las Cruces

Fourth Triennial Silent Auction: Items Needed

Support the IOS by donating items for the Silent Auction.

Quercus xmunzii

The X-Files: the Mystery of Quercus ×munzii

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

Upcoming Events

We do not have any future events scheduled now, but they will appear here as soon as they are announced.

The International Oak Society acknowledges the generous support of the following institutions:

Supporting Institutional Members

Standard Institutional Members

Rice University

The International Oak Society acknowledges the generous support of the following institutions:

Supporting Institutional Members

Standard Institutional Members

Rice University

Featured link

Trees & Shrubs Online

Trees and Shrubs Online is a truly modern reference to temperate trees and shrubs. Currently there are articles for some 730 genera and 4,500 species, including many subspecies, forms and cultivars.