Bulb crop · reference page

Spring onion

A compact allium grown for tender stems rather than a large storage bulb, suitable for narrow containers.

Allium fistulosum

Editorial guidance; no independent agronomic review claimed

Direct-sun reference
About 4 hours
Usable root depth
About 20 cm
Editorial cycle
65–105 days to first harvest
Care
Straightforward care

Getting started

Sowing and space

Direct-sow in rows or transplant small clumps, then thin for airflow.

The cycle is an editorial band linked to the method above. Cultivar, temperature, transplant age and the harvest stage can change it.

Allow about 20 cm of usable depth and roughly 4 cm between plants. A suitably sized container can work when the full root volume and mature canopy are allowed.

Water demand is moderate and regular. That is not a fixed timetable: heat, wind, rain, container size and growth stage change the interval.

Planting windows by broad profile

The highlighted months are conservative editorial references, not a current forecast or postcode calendar. Confirm the cultivar, packet, current warning and local advice.

Tropical wet–dry

JanFebMarAprMayJunJulAugSepOctNovDec

Avoid waterlogged beds and crowded foliage during humid months.

Humid subtropical

JanFebMarAprMayJunJulAugSepOctNovDec

Hot and arid

JanFebMarAprMayJunJulAugSepOctNovDec

Keep the shallow root zone evenly moist while plants establish.

Warm temperate

JanFebMarAprMayJunJulAugSepOctNovDec

Cool temperate

JanFebMarAprMayJunJulAugSepOctNovDec

Practical care

  • Harvest selected stems or whole plants according to variety.
  • Use succession sowing for a steadier supply.

Points to check

  • Dense clumps can trap moisture.
  • Confirm the packet species and intended harvest stage.

Provenance and confidence

This rule is editorial guidance without claimed independent agronomic review. Confidence describes evidence coverage, not the chance of a harvest.