PlantFun
Plant Needs
Sunlight
Full sun to partial shade; thrives in direct sunlight in Mediterranean climates, with light shade tolerated in extreme heat
Watering
Drought-tolerant once established; water deeply but infrequently to encourage deep root growth and avoid waterlogging
Temperature
Hardy to -5°C; prefers warm, dry summers and cool, moist winters typical of Mediterranean regions
Characteristics
- Leaf: Evergreen, elliptical to ovate, glossy dark green upper surface, pale grayish-green lower surface with fine hairs
- Bark: Thick, deeply furrowed cork layer that regenerates every 9–12 years after harvesting
- Flower: Inconspicuous yellow-green catkins; male catkins pendulous, female catkins small and upright
- Fruit: Oval acorns, 2–3 cm long, maturing over 18 months
Care Guide
Watering
Water deeply every 1–2 weeks during prolonged dry spells; reduce watering once the tree is fully established
Fertilization
Apply a balanced slow-release fertilizer once in early spring. Avoid high-nitrogen fertilizers, which may prioritize leaf growth over cork bark development
Composted eggshell powder：Sprinkle a thin layer of crushed, composted eggshells around the tree base; work lightly into the topsoil to avoid disturbing shallow rootsPruning
- Remove dead, damaged, or diseased branches in late winter to improve airflow and reduce disease risk
- Thin crowded inner branches to maintain a rounded, open canopy shape
- Avoid heavy pruning; focus on minimal shaping to preserve the tree's natural form
- Harvest cork bark every 9–12 years once the tree reaches 25–30 years of age, cutting only the outer cork layer without damaging the inner bark
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Ingestion of acorns or leaves may cause vomiting, diarrhea, and abdominal discomfort
Humans: Ingestion of large quantities of acorns may cause gastrointestinal upset due to high tannin content
Garden Uses & Culture
Culture: Cork bark symbolizes sustainability and resilience; historically used in traditional crafts and wine stopper production
Usage: Commercial cork production; ornamental shade tree; wildlife habitat for birds, insects, and small mammals
