The acorn matures in the first year. The black oak, Quercus kelloggii, has a cap that covers over one-half of the nut. The acorn matures in the second year. — Katie Martin, UC Marin master gardener ...

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 … ...

California native of the week: Black oak (Quercus kelloggii) is a gorgeous tree but you would be taking a chance growing it in your backyard because of its potential size.

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So far, the disease has hit hardest at several costal species of oaks — including tanoak (Lithocarpus densiflorus), coast live oak (Quercus agrifolia), and California black oak (Quercus kelloggii).

There are fifteen species of oaks native to California. The four most common oak species in Butte County are valley oak (Quercus lobata), blue oak (Q. douglasii), interior live oak (Q. wislizenni) … ...

These seeds of the oak are large and easy to identify. Endless groves of oaks include Quercus agrifolia on the coast to Quercus lobata in the valleys and Quercus kelloggii in the higher elevations.

During the study, chestnut-backed chickadees foraged on California black oak (Quercus kelloggii) and Douglas-fir (Pseudotsuga menziesii) significantly more than mountain chickadees throughout their ...