PlantFun
Plant Needs
Characteristics
- Leaf: Compound trifoliate leaves with glossy, ovate leaflets; edges may be smooth, toothed, or lobed
- Flower: Small, greenish-yellow clustered flowers; inconspicuous and rarely noticed
- Stem: Woody stems with aerial roots for climbing; young stems may appear hairy while mature stems have smooth, brown bark
Care Guide
Keep soil evenly moist during active growth periods; avoid overwatering to prevent root rot
No regular fertilization required; avoid nitrogen-rich fertilizers which can promote excessive, weak growth. Only apply a thin layer of compost in early spring if soil is nutrient-poor
Composted leaf mold：Apply a 2–3 cm layer of fully composted leaf mold around the base in early spring to improve soil structure; avoid direct contact with stems to prevent rot- Wear thick gloves, long sleeves, and eye protection to avoid contact with urushiol oil
- Cut back climbing vines to prevent spread; dispose of pruned material in sealed bags (do not burn, as smoke releases toxic urushiol)
- Remove young seedlings promptly to limit establishment in unwanted areas
Toxicity
Warning: this plant may be toxic.
Pets: ASPCA: Toxic; contact with urushiol oil causes skin irritation, and ingestion leads to oral discomfort and gastrointestinal upset
Humans: Contains urushiol oil which causes severe contact dermatitis in most humans; smoke from burning plants can cause respiratory irritation
Garden Uses & Culture
Culture: Symbolizes hidden danger and caution in North American folklore; often referenced in outdoor safety guidelines
Usage: N/A (toxic, no ornamental or culinary use)
