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The oak tree in Skjomendalen © Gerhard Sørensen-Fuglem and Cecilia Piccirilli Bjerkeset
An oak grows north of the Arctic Circle in Norway
Website Editor | Aug 14, 2023
Unusual symptoms linked to phytoplasma infection in Quercus humboldtiii, Colombia © Eric Boa
Symptoms linked to phytoplasma infection found in Quercus...
Website Editor | Aug 06, 2023
Different names are being used for one species.
Website Editor | Jun 20, 2023

Plant Focus

A small but mature Alabama sandstone oak producing acorns © Patrick Thompson
A Critically Endangered dwarf oak 

Taking Oaks to the Limit in the Czech Republic

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Béatrice Chassé

Published May 2015 in International Oaks No. 26: 77–88.


The Plaček Quercetum in Kanín, comprises to date about 200 taxa of the genus Quercus. Extreme winter cold, severe and frequent late frosts, 600 mm/24 in of rain annually, and very hot summers set the stage for this ambitious collection started by Dušan Plaček in 2008. The Průhonice Dendrologická Zahrada, Prague’s young botanical garden, headed by Mr. Zdeněk Kiesenbauer, started their oak collection in 2010. The search for hardy plants is a priority for both, and indeed one could say it is the leitmotiv of horticultural history in the Czech Republic.


Plaček Quercetum, oak hardiness, Průhonice Dendrologická Zahrada


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Jablonski, E. 2007. Beitr. Gehölzk. 178 (2007).

Krüssmann, G. 1978. Manual of Cultivated Broad-Leaved Trees & Shrubs. Berlin: Verlag Paul Parey.

Roux, S. de. 2014. Enquête sur les effets du froid de l’hiver 2011-2012. Bulletin de l’Association des Parcs Botaniques de France 58: 54-59.

Smithers, P. 1994. Adventures of a Gardener. London: The Harvill Press.