Last edited by shiny on 4 Nov 2026. View history

Pukekohe Long Keeper Onion

Allium cepa

A variety of onion

A New Zealand heirloom onion. It is described as the best keeping onion, so dry and store it after harvest. A yield of 27 kg per square metre has been recorded, planted 10 cm apart on the diagonal in good, well-fed soil. Sow in trays from February to July, transplant when the tops are 8 to 10 cm high, and harvest in January and February.

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Pukekohe long keeper onion facts

Lifespan

Annual living and reproducing in a single year or less

Growing Pukekohe long keeper onions

  1. Sow seeds in trays 8 weeks before planting out
  2. Dig compost into the bed 1 week before planting out
  3. Water regularly at planting out every week
  4. Weed around the plants 2 weeks after planting out every 2 weeks
  5. Feed with a nitrogen fertiliser 4 weeks after planting out every month
  6. Stop watering as the tops fall over 1 week before first harvest
  7. Lift the bulbs at first harvest
  8. Dry the bulbs in an airy place 1 week after first harvest

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Ecological requirements

Data from the FAO EcoCrop database for Allium cepa L.

Family / Taxonomy Liliopsida
Liliidae
Asparagales
Alliaceae
Optimal temperature 12 - 25 °C
Absolute temperature 4 - 30 °C
Optimal rainfall 350 - 600 mm/year
Absolute rainfall 300 - 2800 mm/year
Optimal soil pH 6.0 - 7.0
Absolute soil pH 4.3 - 8.3
Crop cycle 85 - 175 days
Max altitude 2000 m
Life form herb
Life span biennial
Habit erect
Optimal soil depth medium (50-150 cm)
Optimal soil texture medium, organic
Optimal soil fertility moderate
Optimal soil drainage well (dry spells)
Optimal soil salinity low (<4 dS/m)
Photoperiod short day (<12 hours), neutral day (12-14 hours), long day (>14 hours)
Optimal light clear skies

Licensed under CC-BY-4.0 .

Food and Agriculture Organization of the United Nations (2025) ECOCROP, the crop ecological requirements database. Version 1. https://data.apps.fao.org/catalog/dataset/ecocrop. Accessed through the CGIAR Climate Action Data Hub, https://cgiar-climate-data-hub.github.io/catalog/ecocrop_1/.

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