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Bob Berry, renowned oak collector and longtime member of the IOS, died August 2, 2018 at the age of 102 in Gisborne, New Zealand. Bob...
The Action Oak partnership was launched at this year’s Chelsea Flower Show in London last May
Given its rugged beauty and hardiness, Quercus rugosa is recommended for gardens, parks, and arboreta in most regions. As it grows...
In October 2017, I visited Palomar Mountain State Park, San Diego County, California to collect acorns of the interior live oak, Quercus...
New research published in Nature Plants provides insights into why oaks are long lived. 
North America is home to 91 species of oak trees. Astoundingly, the various species rarely, if ever, occur alone. Where one kind of oak is...
To honor Estonia’s centenary, we chose as subject for this article in our series on Historic Oaks, Estonia’s largest, oldest, and most...
Illinois State Museum features dwarf chinkapin oak, discovered in Illinois during an IOS Tour, as part of the Illinois Bicentennial...
Plant pathologists from the California Department of Agriculture (CDFA) recently identified a new species of fungal pathogen that infects...
Ed Holm lived in Redwood City, California and was born on 4 September 1930 and died 1 January 2018.
There are meetings that prove to be crucial, primordial encounters that mark our lives. My meeting with Michel Timacheff, an afternoon of...
Rainer Lippert has always been interested in old trees. At the age of 16 he started to visit the largest trees in his home district in...

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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

Bob Berry, renowned oak collector and longtime member of the IOS, died August 2, 2018 at the age of 102 in Gisborne, New Zealand. Bob...
The Action Oak partnership was launched at this year’s Chelsea Flower Show in London last May
Given its rugged beauty and hardiness, Quercus rugosa is recommended for gardens, parks, and arboreta in most regions. As it grows...
In October 2017, I visited Palomar Mountain State Park, San Diego County, California to collect acorns of the interior live oak, Quercus...
New research published in Nature Plants provides insights into why oaks are long lived. 
North America is home to 91 species of oak trees. Astoundingly, the various species rarely, if ever, occur alone. Where one kind of oak is...
To honor Estonia’s centenary, we chose as subject for this article in our series on Historic Oaks, Estonia’s largest, oldest, and most...
Illinois State Museum features dwarf chinkapin oak, discovered in Illinois during an IOS Tour, as part of the Illinois Bicentennial...
Plant pathologists from the California Department of Agriculture (CDFA) recently identified a new species of fungal pathogen that infects...
Ed Holm lived in Redwood City, California and was born on 4 September 1930 and died 1 January 2018.
There are meetings that prove to be crucial, primordial encounters that mark our lives. My meeting with Michel Timacheff, an afternoon of...
Rainer Lippert has always been interested in old trees. At the age of 16 he started to visit the largest trees in his home district in...

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