Sweet Wormwood (Artemisia annua)

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Sunlight Thrives in full sun; tolerates partial shade in hot climates, but reduced sunlight may decrease foliage density

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Watering Drought-tolerant; allow the top 2–3 cm of soil to dry completely between waterings to avoid root rot

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Temperature Prefers warm temperate to subtropical conditions; sensitive to frost and temperatures below 10°C

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Leaf: Silvery-green, finely divided feathery foliage with a pungent aromatic scent when crushed
Flower: Small yellow-green composite flower heads arranged in loose terminal panicles
Stem: Erect, branching stems covered in fine silvery pubescence

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Watering

Water when topsoil is dry; avoid overwatering to prevent root rot

Fertilization

Apply diluted low-nitrogen feed once monthly. Over-fertilization may reduce aromatic foliage quality

Composted eggshell powder：Sprinkle a thin layer around the base of the plant; avoid direct contact with stems to prevent burning

Pruning

Pinch back young seedlings to encourage bushier, denser foliage growth
Deadhead spent flower heads to prevent unwanted self-seeding in garden settings
Remove yellowing or damaged foliage to improve air circulation and plant appearance

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may cause vomiting, diarrhea, lethargy, and loss of appetite

Humans: May cause gastrointestinal upset if ingested in large quantities; skin irritation in sensitive individuals

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Culture: Used in traditional Chinese medicine for fever reduction; primary source of artemisinin, a key antimalarial compound

Usage: Medicinal herb, ornamental foliage plant, natural insect repellent