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Quercus rotundifolia trees were in full flower two months earlier than usual in southern Portugal
Quercus rotundifolia, phenology
Posted Tue, 2021-02-09 20:00 in Philip Perry's blog
A strange oak name explained
404655.jpg
Posted Tue, 2021-02-09 11:48 in Patrick Vereecke's blog
An unusual name based on a river in Turkey has quite a few variants
Quercus dschorochensis
Posted Sat, 2021-02-06 18:45 in Patrick Vereecke's blog
Did you know that Turner's oak occurs in the wild?
Quercus xturneri
Posted Mon, 2020-12-14 13:35 in Charles Snyers d'Attenhoven's blog
Sometimes when you least expect it, good things happen.
123847635_367343781227593_2771869126421858320_n.jpg
Posted Sun, 2020-12-13 11:08 in Gaurav Verma's blog
Linnaeus wrote in his prologue of Quercus cerris that it "lives in Spain," but the species does not occur naturally there...
duhamel_du_monceau_h.l._1819_traite_des_arbres_et_arbustes_nouvelle_edition_nouveau_duhamel_vol._7_t._57.jpg
Posted Wed, 2020-12-02 15:08 in Patrick Vereecke's blog
Sabima, a Norwegian NGO, got in touch to let us know about their Hollow Oak Advent Calendar.
calendar_and_leaflet.jpg
Posted Wed, 2020-11-25 20:36 in Roderick Cameron's blog
A documentary inspired by a painting of an oak in Israel.
maxresdefault.jpg
Posted Sat, 2020-10-10 11:01 in Ezra Barnea's blog
Oaks have been featured in several operas. Here is a list of what we found.
p816466406-5.jpg
Posted Fri, 2020-10-09 15:27 in Roderick Cameron's blog
Feedback on the Hybrid Highlight on Quercus ×vilmoriniana
quercus_x_vilmoriniana_maurice_de_vilmorinmet_eikels.jpg
Posted Tue, 2020-06-16 15:24 in Roderick Cameron's blog
The Oak Action Group of Farm Forestry New Zealand is planning to establish American Red Oak Timber Trial Blocks.
Seedlings examined by Oak Interest Group
Posted Wed, 2020-06-10 10:46 in Kathryn Hurr's blog
Remembering John Fairey, legendary plantsman and founder of the amazing Peckerwood Garden, who sadly passed away March 17, 2020.
john_fairey1.jpg
Posted Thu, 2020-05-21 14:55 in Adam Black's blog

Pages

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

Blogs

Quercus rotundifolia trees were in full flower two months earlier than usual in southern Portugal
Quercus rotundifolia, phenology
Posted Tue, 2021-02-09 20:00 in Philip Perry's blog
A strange oak name explained
404655.jpg
Posted Tue, 2021-02-09 11:48 in Patrick Vereecke's blog
An unusual name based on a river in Turkey has quite a few variants
Quercus dschorochensis
Posted Sat, 2021-02-06 18:45 in Patrick Vereecke's blog
Did you know that Turner's oak occurs in the wild?
Quercus xturneri
Posted Mon, 2020-12-14 13:35 in Charles Snyers d'Attenhoven's blog
Sometimes when you least expect it, good things happen.
123847635_367343781227593_2771869126421858320_n.jpg
Posted Sun, 2020-12-13 11:08 in Gaurav Verma's blog
Linnaeus wrote in his prologue of Quercus cerris that it "lives in Spain," but the species does not occur naturally there...
duhamel_du_monceau_h.l._1819_traite_des_arbres_et_arbustes_nouvelle_edition_nouveau_duhamel_vol._7_t._57.jpg
Posted Wed, 2020-12-02 15:08 in Patrick Vereecke's blog
Sabima, a Norwegian NGO, got in touch to let us know about their Hollow Oak Advent Calendar.
calendar_and_leaflet.jpg
Posted Wed, 2020-11-25 20:36 in Roderick Cameron's blog
A documentary inspired by a painting of an oak in Israel.
maxresdefault.jpg
Posted Sat, 2020-10-10 11:01 in Ezra Barnea's blog
Oaks have been featured in several operas. Here is a list of what we found.
p816466406-5.jpg
Posted Fri, 2020-10-09 15:27 in Roderick Cameron's blog
Feedback on the Hybrid Highlight on Quercus ×vilmoriniana
quercus_x_vilmoriniana_maurice_de_vilmorinmet_eikels.jpg
Posted Tue, 2020-06-16 15:24 in Roderick Cameron's blog
The Oak Action Group of Farm Forestry New Zealand is planning to establish American Red Oak Timber Trial Blocks.
Seedlings examined by Oak Interest Group
Posted Wed, 2020-06-10 10:46 in Kathryn Hurr's blog
Remembering John Fairey, legendary plantsman and founder of the amazing Peckerwood Garden, who sadly passed away March 17, 2020.
john_fairey1.jpg
Posted Thu, 2020-05-21 14:55 in Adam Black's blog

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