Watch out for

Allium leaf miner: Remove affected foliage immediately after flowering and burn it to break the pest's life cycle.

Onion fly: Plant in autumn or early spring outside peak flight times and use insect-proof netting as a barrier.

Onion white rot: Avoid planting alliums in infected soil for at least 10 years and ensure excellent drainage.

Onion downy mildew: Improve air circulation, avoid overhead watering, and remove severely infected leaves promptly.

Bulb rot: Plant in well-drained soil or containers and avoid sites that remain wet during winter.