Plant guide
Onion
Allium cepa
Onions are toxic to cats and can damage red blood cells. Keep the growing plant and kitchen onions away from your cat, and contact your veterinarian promptly after suspected ingestion.
What this guide covers: Allium cepa only. Check the botanical name; a photograph alone cannot establish identity.
Photo:
Photo details
Allium cepa — form
By H. Zell
License: CC BY-SA 3.0
Resized and converted to WebP for display; botanical details unchanged.
This displayed image is shared under the same CC BY-SA 3.0 license.
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Photo:
Photo details
Allium cepa — form
By H. Zell
License: CC BY-SA 3.0
Resized and converted to WebP for display; botanical details unchanged.
This displayed image is shared under the same CC BY-SA 3.0 license.
Red Grano onion seeds
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Keep away from cats. We do not recommend this plant for a home where cats could reach it.
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Plant identity
- Scientific name
- Allium cepa
- Scope
- Species
- Family
- Not recorded
- Also known as
- No reviewed aliases available
Find the right spot
How to grow this plant
Allium cepa only. Check the botanical name; a photograph alone cannot establish identity.
- Light
- Sunny position
Full sun.
- Watering
Keep the soil moist but well drained.
- Temperature
- Temperature range not yet established
Cool-season crop; use a planting schedule suited to your region.
- Humidity
No specific humidity target established.
- Potting
- Loose, fertile soil that drains well.
- Through the year
- Harvest when most tops have died down, then cure bulbs with good air circulation. Growing information is for responsible management, not cat-safe planting.
Growing-guide sources
- Allium cepa ↗NC State Extension · Accessed 2026-10-16
Allium cepa only. Check the botanical name; a photograph alone cannot establish identity.
Growing advice reviewed 2026-10-16. Plant safety is assessed separately.
Reviewed safety information
- Toxic principle
- Not recorded in the reviewed evidence
- Reported signs
- Not recorded in the reviewed evidence
- Severity
- Severity not established
Missing information is unknown. It should not be interpreted as an absence of risk.
Safe alternatives
No verified alternative recommendations are available for this guide.