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Group by Sequoiadendron giganteum
IOS Tour of California, Part 1: Northern California
From Davis to Los Angeles
Chris Reynolds | Oct 30, 2024
Group photo at Otay Mountains
IOS Tour of California, Part 2: Southern California
From Los Angeles to the Otay Mountains
John Leszczynski | Oct 30, 2024
Quercus boyntonii Conservation Plan
Quercus boyntonii Conservation Action Plan
Partners at The Morton Arboretum, in collaboration with...
Website Editor | Oct 29, 2024

Plant Focus

Quercus dumosa acorn
Species Spotlight: Quercus dumosa Nutt.
Animals, plants, and fungi depend on this humble tree, but its future—and theirs—is all but certain.
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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