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Growing onions from seed takes longer than leafy greens, but the process is straightforward when divided into four stages: nursery, transplanting, bulb development and curing. For Pakistan’s winter onion crop, timing and spacing are especially important.

Useful GREEN GARDENS links: Red Onion Seeds, Nasarpuri Onion Seeds, Winter Vegetable Seeds, and Grow Bags.

Best Time to Sow Onion Seeds

In Lahore and much of Punjab’s plains, onion seed is commonly started in autumn for a winter nursery, with transplanting after seedlings become strong enough. Exact dates vary by variety and local climate, so follow the selected cultivar’s seasonal recommendations.

Stage 1: Prepare the Onion Nursery

Use a fine, well-drained nursery medium. Sow seed in shallow rows and cover lightly. Keep the bed or tray moist but not saturated. Strong sunlight after germination is important to keep seedlings sturdy.

When Are Onion Seedlings Ready to Transplant?

Seedlings are usually ready when they are pencil-thin, healthy and have several true leaves, often around 6–8 weeks after sowing depending on weather and variety. Harden them gradually before transplanting.

Stage 2: Transplanting

Transplant into a loose, fertile bed or grow bag. Space seedlings roughly 8–12 cm apart, with wider spacing for larger bulbs. Plant only deep enough to secure the roots; burying the neck too deeply can interfere with proper bulb formation.

Best Soil for Onions

Onions prefer well-drained loam with good fertility. Incorporate mature Vermicompost before transplanting. Avoid waterlogging because onion roots are relatively shallow and sensitive to poor aeration.

Watering

Keep the top root zone evenly moist during active growth. Reduce irrigation as bulbs mature and necks begin to soften. Excess water near harvest can reduce storage quality.

Feeding Onions

Onions need steady nutrition during leaf development because each healthy leaf contributes to bulb size. Use balanced fertility rather than excessive nitrogen late in the crop, which can delay maturity.

Growing Onions in Grow Bags

Wide bags are more efficient than very deep individual pots. The G-24 Green Grow Bag provides useful surface area for multiple onion plants in rows.

Bulb Formation

Bulbing is influenced by variety, plant age, temperature and day length. Do not repeatedly cover developing bulbs with soil. Keep the area weed-free so shallow onion roots do not compete for moisture and nutrients.

Harvesting and Curing

When many tops naturally bend over and begin yellowing, reduce watering. Lift bulbs on a dry day and cure them in a shaded, well-ventilated place until outer skins and necks are dry. Proper curing improves storage life.

Frequently Asked Questions

Can onions be direct sown?

Yes, but raising a nursery and transplanting often gives better control of spacing and seed use for home gardeners.

How deep should onion seedlings be planted?

Plant shallowly, covering the roots while keeping the neck close to the soil surface.

Why are my onions not forming bulbs?

Unsuitable variety, poor seasonal timing, excessive crowding, heavy nitrogen or insufficient light can all affect bulb formation.

How do I know onions are ready to harvest?

The tops begin to yellow and fall naturally as bulbs mature.

GREEN GARDENS supports Pakistan’s home gardeners with onion seed, grow bags, organic soil inputs and step-by-step growing guidance.