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Editor's Picks

Emory oak near Young, Arizona © Nanebah Lyndon
Emory oak acorns are a critically important commodity for...
Website Editor | Feb 12, 2021
Ecological Landscape Alliance
Murphy Westwood and Tim Boland presented on oak diversity...
Website Editor | Feb 12, 2021
Keiko Tokunaga's Illustrated Fagaceae
Shaun Haddock reviews Keiko Tokunaga's latest book.
Shaun Haddock | Feb 09, 2021

Plant Focus

Quercus texana New Madrid acorn
Disentangling the cultivar published as Quercus texana ‘New Madrid’

Iberian Holm Oak Jumps the Gun in Portugal

The weather here in the southern part of Portugal (Baixo Alentejo) has been quite dry for the last couple of years. Our seasonal river did not run for two years and our dam dried out completely.

Last year’s rainy season, which started in September, has been much wetter. As a result our seasonal river is flowing and the dam filled up.

A number of plants appear to have had reactions to these wetter conditions. Some of our Iberian Holm Oak (Quercus rotundifolia) trees were in full flower at the beginning of December 2020. Yet most of the Iberian Holm Oaks were still dropping acorns. The usual flowering period is from early February (as per chart below from the Portuguese Botanical Society’s website).

Q. rotundifolia flowering period

It will be interesting to see if the flowers set and produce acorns next year.

Q. rotundifolia in flower 1
Quercus rotundifolia in flower, Baixo Alentejo, Portugal, December 2020 © Phil Perry

Q. rotundifolia in flower 2

Q. rotundifolia in flower 3

Q. rotundifolia in flower 4