Onion
PH
PureHealthness Editorial Team · Health writers & reviewers
📝 Last reviewed: August 2026
✔ Transparent sourcing · Some articles are AI-drafted, then reviewed & fact-checked by our team
📝 Last reviewed: August 2026
The humble onion is the base of nearly every savoury dish. Grown in hundreds of varieties worldwide, its layers hold sharp, sweet or mild flavours depending on type and season.
🔬 Plant facts
| Scientific name | Allium cepa |
|---|---|
| Type | Bulb vegetable |
| Family | Amaryllidaceae |
| Sunlight | Full sun |
| Water | Moderate, even watering |
| Height | 30–90 cm |
| Flower | White globe flower heads |
| Uses | Culinary staple worldwide |
| Growth | Grows from sets or seeds |
| Best season | Cool season |
💊 Onion in the medicine industry
Onions contain quercetin, a strong antioxidant studied for heart health and allergy relief; onion extracts are used in traditional remedies for coughs and wound healing.
🌱 Growing & care tips
Onions need full sun and loose, well-drained soil; water evenly so bulbs grow round, then stop watering to let them cure before harvest.
🍽️ How to use it
Onions are the flavour base of nearly every cuisine — caramelised, fried, pickled, raw in salads; spring onions are the mild young version.
💡 Did you know? The onion's layers and sharp tears come from the same chemical — cutting ruptures cells and releases a gas that forms sulphuric acid in your eyes, which is why you cry.
⚠️ Onion safety note: Onions are safe to eat; very rarely they trigger allergy. Onion extracts are used as traditional remedies but can irritate the skin in some people.
⚠️ Important: Herbal and plant remedies can interact with medicines. Always ask a doctor or pharmacist before using any plant product for health purposes — especially if you are pregnant, breastfeeding or taking prescription drugs.
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