Plantae > Tracheophyta > Magnoliopsida > Fagales > Fagaceae > Quercus > Quercus lobata

Quercus lobata (Californian White Oak)

Synonyms: Quercus hindsiana; Quercus hindsii; Quercus lobata f. argillora; Quercus lobata f. insperata; Quercus lobata subsp. turbinata; Quercus lobata subsp. walteri; Quercus lobata var. argillora; Quercus lobata var. hindsii; Quercus lobata var. insperata; Quercus lobata var. rarita; Quercus lobata var. turbinata; Quercus lobata var. walteri; Quercus longiglanda; Quercus lyrata

Wikipedia Abstract

Quercus lobata, commonly called the valley oak or roble, grows into the largest of North American oaks. It is endemic to California, growing in interior valleys and foothills from Siskiyou County to San Diego County. Mature specimens may attain an age of up to 600 years. This deciduous oak requires year-round access to groundwater.Its thick, ridged bark is characteristic and resembles alligator hide. The valley oak's deeply lobed leaves assist in identification.
View Wikipedia Record: Quercus lobata


Height [3]  98 feet (30 m)
Width [1]  55 feet (16.8 m)
Air Quality Improvement [1]  None
Allergen Potential [1]  Medium-High
Carbon Capture [1]  High
Screening - Summer [2]  Dense
Screening - Winter [2]  Porous
Shade Percentage [1]  79 %
Temperature Reduction [1]  Medium
Wind Reduction [1]  Medium
Hardiness Zone Minimum [1]  USDA Zone: 7 Low Temperature: 0 F° (-17.8 C°) → 10 F° (-12.2 C°)
Hardiness Zone Maximum [1]  USDA Zone: 11 Low Temperature: 40 F° (4.4 C°) → 50 F° (10 C°)
Light Preference [2]  Full Sun
Soil Acidity [2]  Moderate Acid
Soil Fertility [2]  Intermediate
Water Use [1]  Moderate to Low
Flower Color [2]  Yellow
Foliage Color [2]  Green
Fruit Color [2]  Brown
Fall Conspicuous [2]  Yes
Fruit Conspicuous [2]  Yes
Bloom Period [2]  Early Spring
Drought Tolerance [2]  Medium
Edible [3]  May be edible. See the Plants For A Future link below for details.
Fire Tolerance [2]  Low
Flower Type [3]  Monoecious
Frost Free Days [2]  6 months 20 days
Fruit/Seed Abundance [2]  Medium
Fruit/Seed Begin [2]  Summer
Fruit/Seed End [2]  Fall
Growth Form [2]  Single Crown
Growth Period [2]  Spring, Summer
Growth Rate [2]  Rapid
Janka Hardness [4]  1360 lbf (617 kgf) Medium
Leaf Type [3]  Deciduous
Lifespan [2]  Perennial
Pollinators [3]  Wind
Propagation [2]  Bare Root, Container, Seed
Root Depth [2]  3.5 feet (107 cm)
Seed Spread Rate [2]  Slow
Seed Vigor [2]  Medium
Seeds Per [2]  69 / lb (152 / kg)
Shape/Orientation [2]  Rounded
Structure [3]  Tree
Usage [3]  A mulch of the leaves repels slugs, grubs etc, though fresh leaves should not be used as these can inhibit plant growth; Oak galls are excrescences that are sometimes produced in great numbers on the tree and are caused by the activity of the larvae of different insects. The insects live inside these galls, obtaining their nutrient therein. When the insect pupates and leaves, the gall can be used as a rich source of tannin, that can also be used as a dyestuff; The acorn meal has been used to mend cracks in clay pots; Wood - hard and fine grained but brittle and weak. Of no commercial value, it is used only for fuel;
Vegetative Spread Rate [2]  None
View Plants For A Future Record : Quercus lobata

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Table Mountain   California, United States      


Allokermes galliformis (gall-like kermes)[5]
Cameraria lobatiella[6]
Cameraria mediodorsella[6]
Cameraria mendocinensis[6]
Cameraria pentekes[6]
Chionodes chrysopyla[6]
Chionodes formosella (Spring Oak Leafroller)[6]
Chionodes occidentella[6]
Chionodes petalumensis[6]
Chionodes trichostola[6]
Coleophora querciella[6]
Decodes basiplagana[6]
Decodes fragariana[6]
Diaspidiotus osborni (Osborn scale)[5]
Dorithia occidentana[6]
Dorithia semicirculana[6]
Dorithia trigonana[6]
Dyseriocrania auricyanea[6]
Epinotia emarginana[6]
Erynnis tristis (mournful duskywing)[6]
Hemileuca grotei[6]
Kermes cockerelli (Cockerell's kermes)[5]
Kermes rimarum (bark-crevice kermes)[5]
Malacosoma californica[6]
Malacosoma constricta[6]
Nemoria glaucomarginaria[6]
Otospermophilus beecheyi (California ground squirrel)[7]
Phryganidia californica (California oakworm)[6]
Pseudexentera habrosana[6]
Quernaspis quercus (Oak scale)[5]
Rhynchaenus quercus[8]
Sciurus griseus (western gray squirrel)[9]
Sylvilagus audubonii (Desert Cottontail)[10]
Tamias merriami (Merriam's chipmunk)[11]
Telphusa sedulitella[6]
Tischeria consanguinea[6]

Range Map

California (incl. Channel Is.);



Attributes / relations provided by 1i-Tree Species v. 4.0, developed by the USDA Forest Service's Northern Research Station and SUNY-ESF using the Horticopia, Inc. plant database. 2USDA Plants Database, U. S. Department of Agriculture 3Plants For A Future licensed under a Creative Commons License 4Wood Janka Hardness Scale/Chart J W Morlan's Unique Wood Gifts 5Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P. ScaleNet 4 November 2009 6HOSTS - a Database of the World's Lepidopteran Hostplants Gaden S. Robinson, Phillip R. Ackery, Ian J. Kitching, George W. Beccaloni AND Luis M. Hernández 7Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics. 8Biological Records Centre Database of Insects and their Food Plants 9Sciurus griseus, Leslie N. Carraway and B. J. Verts, MAMMALIAN SPECIES No. 474, pp. 1-7 (1994) 10Sylvilagus audubonii, Joseph A. Chapman and Gale R. Willner, MAMMALIAN SPECIES No. 106, pp. 1-4 (1978) 11Tamias merriami, Troy L. Best and Nancy J. Granai, MAMMALIAN SPECIES No. 476, pp. 1-9 (1994)
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Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access