Science · Specimen Trees
Interior Live Oak
An evergreen oak of California interior foothills and valleys. Its dense crown and drought adaptation suit large native landscapes, while grading and frequent summer irrigation can seriously damage mature trees.
Quercus wislizeni · Evergreen California native oak
Profile
- Habitat
- Interior California woodlands; forms vary from shrubs to trees.
- Leaves
- Leathery evergreen leaves may have smooth or spiny margins.
- Planting
- Set the root flare at grade and protect the expanding root zone from compaction.
- Assessment
- Confirm identity, local climate suitability and drainage before prescribing care.
Water & soil targets
- Moisture (VWC)
- Site-calibrated; varies by soil and rootstock
- Salinity tolerance
- Avoid saline irrigation; tolerance is not inferred from drought adaptation.
- Drought tolerance
- High once established.
Optimal root measurement depth
8–18 in
Most absorbing tree roots live in the upper 12–18 inches, out toward the drip line. Typical guidance; confirm with a soil probe on site.
Establish young trees with deep, spaced irrigation and keep mature trunk zones relatively dry in summer; preserve natural grade and broad roots.
Problems to watch
- Oak root fungus
- Borers in declining trees
- Root injury from construction
Stress signs
- Progressive canopy thinning
- Dead limbs
- Collar decay or bleeding
Where you'll find it
- Native habitat restoration
- Large dry-summer shade
More specimen trees
Coast Live OakSouthern Live OakDate Palm (Medjool)Canary Island Date PalmCoast RedwoodJapanese Maple
All Science profilesGeneral agronomic guidance and typical ranges; actual targets vary by site, soil, climate and season.