Oaks are foundational species in much of California, and many oak populations in the state may be in jeopardy due to a lack of recruitment of young trees. Despite considerable interest in this problem ...

We examined the competitive effects of two annual species on soil water potential and blue oak (Quercus douglasii Hook & Arn.) seedling growth and water relations. Two densities of the annual grass ...

Oaks grow in 52 of 58 California counties. In Sacramento County, 20 species of oaks grow with 20 hybrids. The most common are valley oak (Quercus lobata), interior live oak (Quercus wislizeni) and ...

You may have noticed that blue oaks are turning brown in the foothills right now. They aren’t dying — they are utilizing an adaptive strategy that they have evolved over time to thrive in their ...

Blue oak (Quercus douglasii), gray pine (Pinus sabiniana) and buckeye (Aesculus californica) are three species that thrive in rugged local foothill woodland and chaparral habitat. Today and in the ...

Luke Dexter had driven the same stretch of the Silverado Trail for a decade, not noticing anything strange, until one day five years ago when a strange oak caught his eye. After that, he couldn’t ...

There are 10 species of oak listed in John Thomas Howell’s “Marin Flora.” If you are trying to identify oaks, you have to be a keen observer. Does the tree lose its leaves in the fall (deciduous) or ...

Here in Northern California, we are blessed with many stoic and picturesque native oaks. Coastal Live Oak (Quercus agrifolia), Valley Oak (Quercus lobata), and Blue Oak (Quercus douglasii) are all ...

The annual tree rings on these blue oaks (Quercus douglasii) in California’s south Joaquin Valley show how much winter rain has fallen each year. The amount of winter rain in the valley is an ...