Growing Onion

Allium cepa : Amaryllidaceae / the onion family

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

(Best months for growing Onion in New Zealand - cool/mountain regions)

  • S = Plant undercover in seed trays
  • T = Plant out (transplant) seedlings
  • 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 46°F and 86°F. (Show °C/cm)
  • Space plants: 2 - 4 inches 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

05 Mar 19, Carole (New Zealand - cool/mountain climate)
When is the best time to plant red onion seeds and what sort of fertilizer should I use do u use lime?
06 Mar 19, mike (New Zealand - cool/mountain climate)
Best time to plant - read the top of the page. Fertiliser - one with not a high N content. Lime - read up about using lime.
13 Feb 19, robert samuel walker (New Zealand - temperate climate)
when is the best time to put in red onion in christchurch
14 Feb 19, mike (New Zealand - temperate climate)
You have worked out your temperate - looking under onions - it is in the calendar months near the top of the page.
26 Nov 18, raymond (South Africa - Humid sub-tropical climate)
May I know, When to plant onions in an area of Bioresource Group no 1 (Moist Coast forest?) .My mom wants to plant it on a correct time. I ll be a great pleasure to know. Thanks. Raymond Novela
12 Nov 18, John (New Zealand - temperate climate)
My onions growing in Napier are sprouting seed heads. Some are large seeming perhaps fully grown or close but some aren�t. Should I nip the heads and leave them or pull them immediately?
13 Nov 18, Mike (New Zealand - temperate climate)
The onions that are big and going to seed need pulling out now. In fact any that are going to seed need pulling out now. Look up the internet for more info.
11 Nov 18, Phil (Australia - temperate climate)
I usually grow brown onions which store well, however as we were running out I planted white ones as you can plant them earlier in the season. Now I have heaps of good sized white onions which have just started to run to seed, does anyone have good ideas on how to store them longer than a few weeks?
13 Nov 18, Mike (Australia - sub-tropical climate)
From what I have read white don't keep as long as brown. Cure them in the sun for a week or so then keep in a cool dry place spread out - probably best to give some away.
24 Oct 18, Michael Jones (Australia - temperate climate)
when do i plant cipollini onion seeds in west Australia
Showing 161 - 170 of 374 comments

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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. GardenGrow 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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