SelecTree: Tree Detail
MEXICAN BLUE OAK
Very closely related to California native Quercus engelmannii but even more beautiful and refined.
Native to Southwest United States, Mexico.
Rounded or Spreading Shape.
Has Evergreen to Partly Deciduous foliage.
Height: 30 - 60 feet.
Growth Rate: 36 Inches per Year.
Longevity 50 to 150 years or more.
Leaves Oblong, Green, No Change, Evergreen to Partly Deciduous.
Flowers in Spring.
Brown Acorn, fruiting in Fall.
Bark Light Gray, Furrowed, Ridged or Scaly.
Shading Capacity Rated as Moderate in Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 7 - 9 and 14 - 24.
USDA Hardiness Zones 7 - 10.
Exposure Full Sun.
Moist to Dry Soil.
Loam or Sand Texture.
Neutral to Slightly Alkaline Soil pH.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Resistant to Aphids and Powdery Mildew, Sooty Mold, Sudden Oak Death, Verticillium. Susceptible to Invasive Shot Hole Borer, Coddling Moths, Mistletoe, Spittlebugs, Armillaria, Root Rot.
Health, Safety & Environmental Concerns
Branch Strength Rated as Strong.
Root Damage Potential Rated as Moderate.
Allergy and Poisonous Health Hazard.
Fire Resistance is Favorable.
Desirable Wildlife Plant.
Attracts Birds and Squirrels.
Cite this tree:
SelecTree. "Quercus oblongifolia Tree Record." 1995-2020. Aug 14, 2020.
< https://selectree.calpoly.edu/tree-detail/quercus-oblongifolia >