You are here

Blue Oak (Quercus douglasii)

Quercus douglasii is a deciduous tree that is adapted to drought and dry climates, and has an extensive root system to access water. This oak species exhibits masting behavior; all the individuals in a population will have synchronized episodes of acorn production. This is thought to be a mechanism to satiate seed predators so that some acorns can survive predation to germinate the following year. This species is susceptible to Sudden Oak Death disease, a plant pathogen that can have a devastating impact on forests. The CPP four letter code for Quercus douglasii is QUDO.

This species is currently being monitored at John Muir National Historic Site and Seqouia and Kings Canyon National Parks.



Download the USA-NPN datasheet for this species here.

Download the CPP species profile for this species here.


For additional information about this species, visit these pages:

Quercus douglasii  on the USA-NPN website

Quercus douglasii on Calflora

Quercus douglasii  on USDA PLANTS