
Onion
Allium cepa
Onion is a staple ingredient used globally for flavoring food. Grows best in cooler or highland conditions; challenging in hot, humid lowland Malaysia.
Full sun. Onion responds quickly to light quality; weak light usually gives lanky growth and slower recovery after pruning or harvest.
15°C - 25°C (59°F - 77°F). Onion handles Malaysian warmth well, but sudden cold drafts or heat spikes can shock tissues and slow recovery.
50% - 70%. Onion tolerates local humidity better when air movement is good; stale humid air is where fungal trouble usually starts.
🌧️ Good news for Malaysia: Your home's natural humidity is already helping. Focus on airflow instead to prevent fungal issues.
Deep, fertile, well-draining loamy soil with steady organic matter and good moisture retention.
Keep soil moist but well-drained. Use moisture checks for Onion instead of routine overwatering. Root systems need fresh oxygen between watering cycles to stay healthy.
💭 Still unsure? Stick your finger 2 cm into the soil. If it feels dry, water. If it's moist, wait. You'll get it right.
Harvest when tops fall over. For Onion, timely pruning and hygiene are preventive care: better airflow, fewer weak shoots, and steadier growth quality.
Seeds or sets. Onion establishes faster when propagation material is fresh and disease-free, with gentle humidity and no waterlogging.
Toxic to cats and dogs (can damage red blood cells).
Contains antioxidants and sulfur compounds.
Cooking.
Thrips, fungal diseases. Onion is easier to protect with routine scouting and airflow management, because pests and fungal spots spread fast in stagnant humid conditions.
"Avoid waterlogging to prevent rot."
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Disclaimer: Tanam Je is an educational resource. Plant care outcomes vary by environment, weather, and handling. Tanam Je is not liable for plant loss or related damages.