PlantFun
Plant Needs
Sunlight
Full sun to partial shade; thrives in bright, direct sunlight and tolerates mild shade in hot, arid climates
Watering
Water deeply but infrequently, allowing the top 15–20 cm of soil to dry completely between waterings; reduce watering frequency in winter
Temperature
Hardy to -10°C; adapted to hot, dry Mediterranean summers and cool, mild winters
Characteristics
- Leaf: Small oblong to elliptical leaves with serrated margins, glossy dark green upper surface, pale woolly undersides
- Flower: Inconspicuous yellow-green catkins; male catkins pendulous, female catkins clustered near branch tips
- Stem/Bark: Grey-brown fissured bark; branches produce spherical, woody galls formed by wasp larvae infestation
Care Guide
Watering
Water every 7–10 days during prolonged dry spells to support new growth
Fertilization
Apply a balanced slow-release fertilizer once in early spring to support new foliage growth. Do not over-fertilize, as the tree is adapted to low-fertility soils
Eggshell powder topdressing：Crush dried, clean eggshells into a fine powder; sprinkle 1–2 tablespoons around the base of the tree and water lightly to release calcium into the soilPruning
- Remove dead, diseased, or damaged branches in late winter to improve airflow and reduce pest risk
- Thin overcrowded branches to maintain a balanced, open canopy and promote sunlight penetration
- Avoid heavy pruning, as oak trees recover slowly from severe cutting; limit pruning to minor shaping only
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic; tannins can cause vomiting, diarrhea, lethargy, and abdominal pain
Humans: Ingestion of large quantities of leaves or galls may cause gastrointestinal irritation, nausea, and vomiting due to high tannin content
Garden Uses & Culture
Culture: Galls produced on its branches have been used in traditional medicine, dye production, and tanning for over 2,000 years
Usage: Ornamental shade tree, wildlife habitat for birds and insects, and source of medicinal galls
