Pronounciation: QUER-cus SUE-ber

Hardiness zones
Sunset 5-7 (occasional winter damage), 8-16, 18-23
USDA 8-11

Landscape Use: Commercial and residential oak, landscape novelty tree, chaparral and Mediterranean type landscape, specimen tree, street tree. Use with discretion in urban landscapes because of eventual large size

Form & Character: Rugged, mostly upright, open, not as spreading as Quercus fusiformis.

Growth Habit: Evergreen, woody, broadleaf perennial tree, slow growth rate when young to moderate with age to 50-feet tall in Phoenix with near equal spread, somewhat taller elsewhere.

Foliage/Texture: Small, ovate leaves to 3-inches long, often toothed, dark green above to gray tomentose beneath, leaves drop in early spring as new leaves appear. Cork oak trees are famous for producing a thick corky phellem (bark). Generally, cork oak trees have a medium fine textured canopy of foliage that contrasts nicely against the tree's fissured, coarse-textured trunk and branches.

Flowers & Fruits: All oaks are dioecious, male and female flowers are mostly yellowish and inconspicuous in axillary positioned catkins; fruits are an acorn with cap enclosing about 1/3 to 1/2 of nut, edible after roasting.

Seasonal Color: None

Temperature: Tolerant

Light: Full sun

Soil: Tolerant, yellows in highly alkaline soils, good drainage.

Watering: Drought tolerant, give infrequent deep irrigations during summer.

Pruning: Little except to elevate canopy base (crown raise).

Propagation: Seed

Disease and Pests: Spider mites

Additional comments: The phellum (laypersons call this bark) of cork oak yields commercial cork. Vandalism of the trunk can be a huge problem in highly visible, public areas. Otherwise, this is a great, albiet slow-growing, live oak tree for Arizona desert urban landscapes.