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Growing Onion

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

(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

24 Jun 19, Cassie (Australia - cool/mountain climate)
And make sure you plant varieties that cope with your particular climate. Many varieties dont cope well with heat and will bolt to seed
08 Jun 19, Ben Camenzuli (Australia - sub-tropical climate)
What is it that onions do not like as they grow ?? What is they like ? How to prevent onions going to seed ???
10 Jun 19, (Australia - tropical climate)
Too much N. Water them. Pick them before they seed.
24 May 19, Yvonne Hermann (Australia - sub-tropical climate)
I bought a large bag of salad(red) onions but due to unfortunate circumstances didn’t get use a lot of them. I now have approx 70 shooting onions. Can I plant these and will they produce new onions? How long from planting to harvesting & is now the right season in Queensland? Thanks in advance Yvonne
18 Apr 19, SHIREEN WALTERS (South Africa - Summer rainfall climate)
Can I plant spring onions and coriander now (middle April) ?
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
Showing 11 - 20 of 228 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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