PlantFun
Plant Needs
Characteristics
- Leaf: Oblong to obovate, 5–15 cm long, with rounded lobes and pale pubescent undersides
- Flower: Male catkins are yellow-green, pendulous; female flowers are small, reddish, clustered at branch tips
- Stem/Bark: Mature bark is thick, furrowed, dark gray-brown; young stems have fine, soft hairs
Care Guide
Young trees: Water deeply every 7–10 days; mature trees: Water only during 2+ weeks of drought
Apply balanced slow-release fertilizer once in early spring. Use low-nitrogen fertilizer to avoid excessive foliage growth that may weaken branch structure
Eggshell powder topdress：Crush dried eggshells into fine powder; sprinkle 1–2 tbsp around the base of young trees, keeping powder 10 cm away from stems to avoid irritation- Remove dead, diseased, or crossing branches in late winter to early spring before new growth emerges
- Thin crowded branches to improve airflow and light penetration through the canopy
- Shape young trees to establish a strong central leader; avoid heavy pruning on mature trees, as they heal slowly
Toxicity
Warning: this plant may be toxic.
Pets: ASPCA: Toxic due to tannins; may cause vomiting, diarrhea, abdominal pain, and potential kidney damage in severe cases
Humans: Ingestion of large amounts of acorns or leaves may cause gastrointestinal upset due to tannin content
Garden Uses & Culture
Culture: Symbolizes strength and longevity in Pacific Northwest indigenous cultures; acorns were a traditional food source after tannin leaching
Usage: Ornamental shade tree; acorns provide food for wildlife; wood used for furniture and craftwork
