Common Names: cork oak
Type: Evergreen tree
Size: 30–60 ft. high and wide; prune to control.
Flowers: Tiny yellow-green flower, spring, acorns about 1.5 in. long; shiny dark green 3 in. leaves. Spectacular deeply furrowed and colorful bark.
Uses: Large areas, shade tree, focus, street tree, background, stunning bark. Tolerates heat. Fire resistive.
Wildlife: Acorns are food source. Butterfly larvae. Deer resistant.
Soil: Prefers well-drained soil. Tolerant of a variety of soils; foliage may turn yellow in highly alkaline soil.
Water: Low after established.
Sun: Full sun.
Pruning: May require formative pruning for prolonged tree health. Remove dead or damaged material in late autumn through winter.
Pests & Diseases: Aphids, powdery mildew, honey fungus.
Notes: After 25 years, about 1/3 of the tree’s cork is harvested every 9 to 15 years, primarily in Portugal, Spain, and Algeria. Look for many other oaks in various sizes in the Garden. Hardy to 10° F.