Growing Onion

Allium cepa : Amaryllidaceae / the onion family

Jan F M A M J J A S O N Dec
      P       P P P P P

(Best months for growing Onion in USA - Zone 9b regions)

  • P = Sow seed
  • Easy to grow. Grow in seed trays, and plant out in 4-6 weeks. Sow seed at a depth approximately three times the diameter of the seed. Best planted at soil temperatures between 8°C and 30°C. (Show °F/in)
  • Space plants: 5 - 10 cm apart
  • Harvest in 25-34 weeks. Allow onions to dry before storing.
  • Compatible with (can grow beside): Lemon Balm, Borage, Carrots, Beets, Silverbeet, Lettuce, Amaranth
  • Avoid growing close to: Peas, Beans

Your comments and tips

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17 Jun 22, Anonymous (Canada - Zone 4b Temperate Warm Summer climate)
Go to the blue tab above and work out which zone you are. Pick what variety you want to grow.
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02 Jun 22, Rick Nuffer (USA - Zone 7a climate)
do walla walla onions grow well in Utah?
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18 Apr 22, Graham Bower (Australia - temperate climate)
I have been growing butternut pumpkin and trombone zucchini in close proximity and saving seed for following season. I saved seed from each for this seasons planting. This year my produce appears to be a cross of thes two . Is this possible? Can these cross pollinate? The fruit has been huge and eats very much like a quality butternut.
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21 Apr 22, Anonymous (Australia - temperate climate)
I believe they do cross pollinate.
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26 Mar 22, Heidi (Australia - temperate climate)
I have some onion sets left over from last year and want to plant them. All the articles I have seen thus far talk about growing them from seed/seedlings. Ours is a temperate climate, so when is a good time to plant them?
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19 Apr 22, Graham (Australia - temperate climate)
Sets . Another word for seedlings. If they are still fresh and viable they should be OK. In saying that, I am surprised that they are still OK from last year. (Gardenate : 'sets' are usually small onion bulbs with brown, papery skin)
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29 Mar 22, Anonymous (Australia - sub-tropical climate)
Check the top of the onion page.
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21 Feb 22, Narelle (Australia - tropical climate)
Is Mackay too hot to grow onions? What's the best variety for up here? Thanks
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22 Feb 22, (Australia - tropical climate)
Any variety.
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22 Feb 22, Anonymous of Bundaberg (Australia - tropical climate)
Go to onion, set the climate zone to tropical and it will show you in the calendar guide. They take a long time to grow and are generally cheapish in shops.
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This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. Gardenate is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
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