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One-fourth of the United States’ oak species are now considered of conservation concern, according to data compiled by researchers at The...
This article is an account of the oak field trip organized by Michael Meléndrez in New Mexico (and a bit of Arizona) in August 2017. 
There are more ancient oaks in England than in all of continental Europe. How is that possible? One would expect to find the reasons in...
ArbNet is an interactive community of arboreta, sponsored and coordinated by The Morton Arboretum in cooperation with the American Public...
As we celebrate 25 years of the IOS, we take a look at oaks that have an association with silver. In a Species Spotlight Joeri Strijk...
An acorn from a specimen of Quercus insignis growing in Hackfalls Arboretum in New Zealand germinated earlier this year.
Twenty-six participants from ten countries arrived to take part in the European celebration of the IOS’s twenty-fifth birthday at Dušan...
Quercus argentata is an evergreen tropical oak native to the islands of Borneo (absent in Brunei), Sumatra, and Western Java, as well as to...
The subject of the latest addition to our Oak Artist series is Harriet Blum, whose work straddles the media of photography and painting:...
Earl Cully, 90, of Jacksonville, Illinois passed away on Wednesday, May 31, 2017 at his home. Earl was a long-time member of the...
Quercus ithaburensis Decne. is a deciduous oak species native to the East Mediterranean basin. 
A naturally occurring hybrid, widely adopted by the nursery trade in the form of cultivars, labors under a misnomer: there is precious...

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Editor's Picks

Past IOS President Allen Coombes, Curator of Scientific Collections at Puebla University Botanic Garden, discusses leaf variability in Quercus ceirpes (still image from the documentary)
A new documentary by Maricela Rodríguez Acosta
Website Editor | Feb 17, 2026
Quercus miyagii acorn and dried leaves
A rare oak endemic to the Ryukyu Islands of Japan
Elion Jam | Feb 16, 2026
A moss-covered oak (Quercus orocantabrica) in Mata de Albergaria, Peneda-Gerês National Park, Portugal  © Amit Zoran
Steve Potter reviews a new book that features oaks
Steve Potter | Feb 11, 2026

Plant Focus

Quercus canariensis in Cornwall Park, Epsom, Auckland, New Zealand, the champion specimen in New Zealand, planted in the 1920s, 27.2 m tall with a trunk diameter of 209 cm (G. Collett pers. comm. 2026)  © Gerald Collett
Antonio Lambe shares his views on this threatened oak native to Iberia and North Africa

All Articles

One-fourth of the United States’ oak species are now considered of conservation concern, according to data compiled by researchers at The...
This article is an account of the oak field trip organized by Michael Meléndrez in New Mexico (and a bit of Arizona) in August 2017. 
There are more ancient oaks in England than in all of continental Europe. How is that possible? One would expect to find the reasons in...
ArbNet is an interactive community of arboreta, sponsored and coordinated by The Morton Arboretum in cooperation with the American Public...
As we celebrate 25 years of the IOS, we take a look at oaks that have an association with silver. In a Species Spotlight Joeri Strijk...
An acorn from a specimen of Quercus insignis growing in Hackfalls Arboretum in New Zealand germinated earlier this year.
Twenty-six participants from ten countries arrived to take part in the European celebration of the IOS’s twenty-fifth birthday at Dušan...
Quercus argentata is an evergreen tropical oak native to the islands of Borneo (absent in Brunei), Sumatra, and Western Java, as well as to...
The subject of the latest addition to our Oak Artist series is Harriet Blum, whose work straddles the media of photography and painting:...
Earl Cully, 90, of Jacksonville, Illinois passed away on Wednesday, May 31, 2017 at his home. Earl was a long-time member of the...
Quercus ithaburensis Decne. is a deciduous oak species native to the East Mediterranean basin. 
A naturally occurring hybrid, widely adopted by the nursery trade in the form of cultivars, labors under a misnomer: there is precious...

Pages

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

Supporting Institutional Members

 

Standard Institutional Members

Rice University
San Diego Botanic Garden logo
San Diego Zoo Wildlife Alliance logo
South Carolina Botanical Garden

 

The Huntington
The John Fairey Garden