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Editor's Picks

Karl Georg Theodor Kotschy was an Austrian botanist and...
Eike Jablonski | Jun 11, 2016
Quercus grisea - Greenlee County, AZ
This article is an account of the oak field trip organized...
Charles Snyers | Sep 22, 2017
North American oaks have a northern temperate origin and...
Website Editor | Oct 12, 2017

Plant Focus

Quercus acutissima subsp. kingii
Quercus acutissima Carruth. is a species whose natural distribution covers a vast territory in East and Southeast Asia, from central Nepal...

Oak Open Days

Blowing Out 25 Candles at Starhill

The International Oak Society celebrates its 25th anniversary at Starhill Forest Arboretum.

Czech Republic Oak Open Days

The house at Plaček Quercetum

Twenty-six participants from ten countries arrived to take part in the European celebration of the IOS’s twenty-fifth birthday at Dušan Plaček’s Quercetum near Podĕbrady in the Czech Republic. 

Oak Open Days in Argentina

The first IOS Oak Open Day event south of the Equator took place April 22-24, 2016, in Argentina.

UK Oak Open Days 2015

In July 2015 a group of IOS members visited Gredington in north Wales and Ness Botanic Garden near Liverpool, England.

Oak Open Days at Trompenburg Arboretum

IOS Board member Gert Fortgens welcomed around 30 participants to a most enjoyable two-day "Oak Open Days" event at Trompenburg Arboretum in Rotterdam, Netherlands, on August 28 and 29, 2014.

Oak Open Days in Gloucestershire, UK - July 6-7, 2014

A double Oak Open Day: Christine Battle's Congrove Arboretum followed by a visit to the National Arboretum at Westonbirt.

Oaks in Aiken

Oak Open Days were held in the incomparable setting of Aiken, SC, during the first weekend of November 2013.

Clonal Propagation of Oaks

On Sunday, 22nd of September 2013, about 30 oak enthusiasts gathered at Pavia Nurseries in Deerlijk, Belgium for an Oak Open Day that was to be devoted to clonal propagation of oaks.

A Sunny Day in the UK

On the morning of July 29, 40 oak enthusiasts from Belgium, the Czech Republic, France, the Netherlands, Italy, and the United Kingdom met in Jermyn’s House at the Sir Harold Hillier Gardens for the first Oak Open Day of the year.

Oak Open Day in Belgium 2011

A visit to two Belgian collections on a rainy September day, Arboretum Wespelaar and the National Botanical Garden of Belgium. 

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