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2026 UK Oak Open Day #1: White House Farm and ArboretumUK Oak Open Days: Jan Awouters reports on the visit to Maurice Foster's collections of cultivars, hybrids and wild-sourced woody plants
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2026 UK Oak Open Day #2: Wynkcoombe ArboretumDavid Adams shares his account of the visit to Nicholas Smith’s oak collection in West Sussex
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Epigenetics and Climate Response in Quercus hinckleyiAntonio Castilla and colleagues share the progress of an IOS-funded conservation project
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Cyprus, April-May 2026 – Vacation ImpressionsEzra Barnea shares images and observations from a trip to view oaks in Cyprus
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Red Oaks Updated on Trees and Shrubs OnlineTrees and Shrubs Online has announced the publication of its updated treatment of the cultivated oak species in Quercus Section Lobatae.
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Species Spotlight: Quercus orocantabricaAn intriguing species from northwestern Iberia with a complex taxonomic and nomenclatural history
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Taxonomists Huddle at HarvardThe Harvard University Herbaria hosted a novel Oak Taxonomy Workshop
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OC&R 2025 AppealThe IOS has launched the 2025 Appeal for the Oak Conservation and Research Fund
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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.
Editor's Picks
Images and insights from Ezra Barnea’s journey to Cyprus’s...Ezra Barnea | Jun 13, 2026
Endangered oak Quercus hinckleyi shows strong genetic...Website Editor | Jun 09, 2026
New paper should significantly change our approach to...Steve Potter | Jun 09, 2026Plant Focus
Roderick Cameron and Carlos Vila-Viçosa give an account of this intriguing species from northwestern Iberia with a complex taxonomic and...Latest Articles
Mountain building in Mexico and Central America contributed to oak diversityLatest Blog Posts
The iconic Quercus suber is in decline
Trees and Shrubs Online has announced the publication of its updated treatment of the cultivated oak species in Quercus Section Lobatae.
Below are some brief summaries of research reports carried out in partnership with the UK Forestry Commission’s research arm, Forest Research.
Help sought for silvopasture research
Over U$S 2,000 raised for student scholarshipsUpcoming Events
Monday, 21 September 20267-day journey through some of Türkiye’s diverse ecoregions
Thursday, 15 October 2026The Tour will focus on Georgia and Alabama, with incursions into South Carolina and northern Florida.The International Oak Society acknowledges the generous support of the following institutions:
Supporting Institutional Members
Standard Institutional Members
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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.User login
The International Oak Society acknowledges the generous support of the following institutions:
Supporting Institutional Members
Standard Institutional Members
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International Oak Society
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Contact us by email: postmaster@internationaloaksociety.org
