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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)
"Oaks: the Backbone of Mexico" – New Documentary Film
A new documentary by Maricela Rodríguez Acosta
Website Editor | Feb 17, 2026
Quercus miyagii acorn and dried leaves
In Search of Quercus miyagii: A Field Report from Okinawa
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
Amit Zohran's "Oakollective"
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
Species Spotlight: Quercus canariensis Willd.
Antonio Lambe shares his views on this threatened oak native to Iberia and North Africa
Read more

2016: A Good Year For Acorns at the Arboretum des Pouyouleix

By Béatrice Chassé | July 31, 2016
Quercus dolicholepis

Last year (2015) several species that had never produced acorns did so (Quercus acutissima,  Q. agrifolia, Q. faginea subsp. broteroi, Q. frutex, and Q. hirtifolia). One of the Q. hirtifolia acorns germinated where it fell.

This year a great number of species are producing acorns for the first time. Nearly every day, I am discovering new ones. This is most probably related to the age of these trees but I was wondering if there might not be some correlation between this and the weather we have had in northern Europe this year, i.e., a very mild winter and enormous amounts of rain throughout spring until the end of June? I would be interested to know if others are noticing a significant number of “first-time-fruiting” trees.
 

  • Q. grahamii × mexicana (APO634; 12 yrs old)
  • Q. brantii (APO157; grafted tree, planted 12 yrs ago)
  • Q. buckleyi (APO127; estimated age: 17 yrs old)
  • Q. ×capesii (APO604; grafted tree, planted 11 yrs ago)
  • Q. crassipes (APO820; 10 yrs old)
  • Q. dolicholepis (APO912; 11 yrs old)
  • Q. eduardi (APO793; 10 yrs old)
  • Q. emoryi (APO423; 14 yrs old)
  • Q. ×heterophylla (APO752; estimated age: at least 12 yrs old)
  • Q. hypargyrea (APO628; 11 yrs old)
  • Q. hypoleucoides (APO784; 10 yrs old)
  • Q. imbricaria (APO76; estimated age: at least 18 yrs old)
  • Q. laeta (APO1235; 8 yrs old)
  • Q. ×libanerris (APO362; estimated age: at least 14 yrs old)
  • Q. myrtifolia (APO927; 9 yrs old)
  • Q. palmeri (APO1245; 8 yrs old)
  • Q. palustris (APO104; estimated age: at least 17 yrs old)
  • Q. prinoides (APO113; estimated age: at least 17 yrs old)
  • Q. shumardii (APO117; estimated age: at least 17 yrs old)
  • Q. texana (APO119; estimated age: at least 17 yrs old)

The species that have been producing acorns consistently for several years now include:
 

  • Q. acerifolia
  • Q. aff. miquihuanensis
  • Q. coccifera subsp. calliprinos
  • Q. dentata
  • Q. galeanensis
  • Q. hintoniorum
  • Q. ilicifolia
  • Q. marilandica
  • Q. miquihuanensis
  • Q. monimotricha
  • Q. pumila
  • Q. striatula
  • Q. wislizeni var. frutescens
Quercus palmeri Quercus shumardii
​
Quercus myrtifolia Quercus prinoides
Quercus brantii Quercus imbricaria
​
Quercus eduardi Quercus grahamii × mexicana
Quercus crassipes Quercus hypleucoides

All photos © Béatrice Chassé