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Editor's Picks

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Lloyd Kenyon (1947 – 2019)
Everyone who knew Lloyd will be as shocked and saddened as...
Shaun Haddock | Aug 24, 2019
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Oaks in Two Parks of the Northern Great Plains
This report highlights two sites near the limits of the...
Dirk Giseburt | Aug 08, 2019
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Eating Acorns to Save the World
Marcie Mayer’s new book, Eating Acorns, has soft “wipeable”...
Roderick Cameron | Aug 07, 2019

Plant Focus

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Cultivar Close-Up: Mighty Miniatures
Dwarf cultivars can be ideal for a small garden. Here are three "mini oaks". 
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Plant Focus

Cultivar Close-up: Hi-Yo Silver!

By Roderick Cameron | August 19, 2017

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 describes Quercus argentata (the epithet derives from the Latin word for silver: argentum) and below are three well-known cultivars with silver associations.

Species Spotlight: Quercus argentata Korth.

By Joeri Strijk | August 16, 2017

Quercus argentata is an evergreen tropical oak native to the islands of Borneo (absent in Brunei), Sumatra, and Western Java, as well as to Peninsular Malaysia.

Species Spotlight: Quercus ithaburensis Decne.

By Jean Stephan | June 5, 2017

Quercus ithaburensis Decne. is a deciduous oak species native to the East Mediterranean basin. 

Hybrid Highlight: Quercus ×hispanica Lam. - A Non-Hispanic Hybrid

By Roderick Cameron | March 30, 2017

A naturally occurring hybrid, widely adopted by the nursery trade in the form of cultivars, labors under a misnomer: there is precious little Hispanic about Quercus ×hispanica. 

Cultivar Close-up: Quercus ×bebbiana 'Taco'

By Ryan Russell | August 1, 2016

Found in the late 1980s by Guy Sternberg in Springfield, Illinois, this selection was noted early on for its rapid growth rate and strong central leader. 

Cultivar Close-up: Quercus robur 'Timuki'

By Ryan Russell | August 1, 2016

This cultivar was selected by Raimond Cinovskis, from the Botanical Garden of the Academy of Sciences, Salapils, Latvia and was introduced by Silva Tarouca Research Institute for Landscape and Ornamental Gardening, Průhonice, Czech Republic.

Hybrid Highlight: Quercus ×heterophylla F. Michx.

By Ryan Russell | August 1, 2016

Named in honor of one of America’s first botanists, John Bartram, Quercus ×heterophylla is known by many as Bartram’s oak.

Species Spotlight: Quercus ilicifolia Wangenh.

By Website Editor | June 4, 2016
Quercus ilicifolia

Quercus ilicifolia is a little oak with a big name: bear oak. 

Species Spotlight: Quercus crassifolia Bonpl.

By Roderick Cameron | January 26, 2016

Quercus crassifolia is tree ranging in height from 4 to 15 meters, and is usually easily recognized by its leaves: stiff and leathery, glossy blackish green above, covered with a layer of pale brown hairs beneath, and with bristle-tipped teeth above the widest part of the leaf.

Species Spotlight: Quercus rotundifolia Lam.

By Website Editor | March 8, 2015

A Mediterranean oak with a long-standing relationship with humanity.

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