Green Onion (Allium fistulosum)

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Sunlight Full sun to partial shade; produces lusher foliage in full sun, tolerates mild shade in hot climates

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Watering Water when the top 2 cm of soil is dry; avoid overwatering to prevent bulb rot

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Temperature Hardy to -10°C; thrives in 15–25°C; tolerates light spring and autumn frost

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Leaf: Hollow, cylindrical green leaves with upright linear growth
Flower: Umbel of small, star-shaped white flowers atop tall, rigid scapes
Stem: Fibrous root system with a small, clustered bulb base; no woody stem tissue

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Watering

Keep soil consistently moist to support active leaf growth; avoid waterlogging

Fertilization

Diluted balanced liquid feed every 2 weeks. Avoid high-nitrogen fertilizers to prevent excessive leaf growth at the expense of bulb development

Eggshell Powder Topdress：Crush clean, dried eggshells into fine powder; sprinkle lightly on soil surface to boost calcium levels and deter slugs

Pruning

Harvest outer leaves regularly to encourage new, tender growth from the center
Trim flower scapes as they emerge to redirect energy to leaf and bulb production
Remove yellowing or damaged leaves to maintain plant health and airflow

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to thiosulphate content; may cause anemia and gastrointestinal distress

Humans: Safe in culinary quantities; excessive ingestion may cause mild gastrointestinal upset

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Culture: Symbolizes freshness and culinary tradition in East Asian cuisine

Usage: Culinary herb for flavoring savory dishes; edible leaves and small bulbs