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Micropropating oaks

A reliable asexual propagation method for oaks is crucial for introducing superior hybrid oak selections into the nursery trade as named cultivars. 

Karl Georg Theodor Kotschy and the Kotschy Oak

kotschy_from_lack.jpg

Karl Georg Theodor Kotschy was an Austrian botanist and eminent plant explorer. He died 150 years ago in Vienna on June 11, 1866.

Vallonea or Aegilops Oaks, a Short Review

quercus_ithaburensis_native_habitat.jpg

A review of the assemblage of the oaks known as the "vallonea oaks" or "aegilops oaks" from the Eastern Mediterranean and the Levant.

Oak Red Listing Project Update

Quercus oglethorpensis seedlings, Jasper Co., Georgia, USA

In January, 2015, The Morton Arboretum launched a project in collaboration with BGCI and the IUCN/SSC Global Tree Specialist Group, which aims to complete IUCN Red List threat assessments for all of the world's oak species. 

Garry Oak Project

Garry oak along the waterfront of Oak Harbor

The newly founded Oak Harbor Garry Oak Society in Oak Harbor, Washington is committed to the stewardship of Garry oak trees through outreach, education and preservation.

Truffle-oaks in Argentina

Truffle-oaks in Espartillar, Argentina.

Where were most oaks planted in Argentina during the last three years? One might guess that it would be in one of the collections of the few quixotic quercophiles in that country, or perhaps a landscape designer with a preference for Quercus was responsible, or a particularly zealous specialist nursery.

Q. xintrogressa

This unusual hybrid was described by Paul Thomson in 1977 from a location in Lafayette County, Missouri. 

Damaged scrub oak habitat in central Florida is being restored—one acorn at a time.

For Acorns, Size Matters—and So Does Shape

Quercus lamellosa - Photo: ©Shaun Haddock

The aim of this brief essay by Francisco Vázquez is to set out the more frequently encountered morphological variations in the genus Quercus and their possible causes and/or consequences within the niche or habitat occupied by the individual plants.

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

Dendrology

Micropropating oaks

A reliable asexual propagation method for oaks is crucial for introducing superior hybrid oak selections into the nursery trade as named cultivars. 

Karl Georg Theodor Kotschy and the Kotschy Oak

kotschy_from_lack.jpg

Karl Georg Theodor Kotschy was an Austrian botanist and eminent plant explorer. He died 150 years ago in Vienna on June 11, 1866.

Vallonea or Aegilops Oaks, a Short Review

quercus_ithaburensis_native_habitat.jpg

A review of the assemblage of the oaks known as the "vallonea oaks" or "aegilops oaks" from the Eastern Mediterranean and the Levant.

Oak Red Listing Project Update

Quercus oglethorpensis seedlings, Jasper Co., Georgia, USA

In January, 2015, The Morton Arboretum launched a project in collaboration with BGCI and the IUCN/SSC Global Tree Specialist Group, which aims to complete IUCN Red List threat assessments for all of the world's oak species. 

Garry Oak Project

Garry oak along the waterfront of Oak Harbor

The newly founded Oak Harbor Garry Oak Society in Oak Harbor, Washington is committed to the stewardship of Garry oak trees through outreach, education and preservation.

Truffle-oaks in Argentina

Truffle-oaks in Espartillar, Argentina.

Where were most oaks planted in Argentina during the last three years? One might guess that it would be in one of the collections of the few quixotic quercophiles in that country, or perhaps a landscape designer with a preference for Quercus was responsible, or a particularly zealous specialist nursery.

Q. xintrogressa

This unusual hybrid was described by Paul Thomson in 1977 from a location in Lafayette County, Missouri. 

Damaged scrub oak habitat in central Florida is being restored—one acorn at a time.

For Acorns, Size Matters—and So Does Shape

Quercus lamellosa - Photo: ©Shaun Haddock

The aim of this brief essay by Francisco Vázquez is to set out the more frequently encountered morphological variations in the genus Quercus and their possible causes and/or consequences within the niche or habitat occupied by the individual plants.

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