Growing Onion

Allium cepa : Amaryllidaceae / the onion family

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

(Best months for growing Onion in USA - Zone 5a regions)

  • S = Plant undercover in seed trays
  • 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

10 May 21, Tony (New Zealand - temperate climate)
try spraying regularly with copper, also good for rust.
06 May 21, Anonymous (New Zealand - temperate climate)
Ring your local agricultural or agric company department about the fungus.
06 Apr 21, Duke Rick (USA - Zone 8b climate)
What is the best time to plant Maui onion seeds in my zone?
05 Jan 22, don (USA - Zone 10b climate)
when you are on this page - just above the title
02 Apr 21, Debbie h. (USA - Zone 9b climate)
Can you plant onions that already have a green stem coming from it? Like ones in fridge if not used fast enough .
22 Jun 21, Jayne Matzkin (USA - Zone 9b climate)
I've done it. You take the outside layers off until you reach the layers the green stem is attached to and plug it in your garden. They become a bigger version of themselves. I see this a way of not wasting that onion and tossing it.
07 Oct 22, Janelle (USA - Zone 10a climate)
Yes, I just did exactly that this summer. Instructions on previous reply are correct.
08 Apr 21, Anon (USA - Zone 4b climate)
Put the question into google and it will explain how to do it.
25 Mar 21, Jean (Australia - temperate climate)
My onion bed is prepared with plenty of chook poo, and top soil containing sheep and cow manure..plus lime and water retaining dressing.. Are there any other element missing or anything l'm putting on that is not necessary.? Why do the onions have thick necks? Am I leaving the onions too long before harvesting when seed stalks appear? I would appreciate your advice. I live in Lake Clifton 6215 WA on sandy soil which we are building up with compost and manures , lime etc
26 Mar 21, Anonymous (Australia - sub-tropical climate)
Onions don't need really rich soil, as in heaps of nitrogen. They are a bulb and need Phosphate. With the sandy soil better to build it up with mulchy compost, it can have a bit of chicken/sheep/cow manure in the compost. Or at the end of your growing season add manures grass clipping leaves etc to your soil and turn it and water (rain hopefully) during your fallow time, If you do that over 3-4-5 months then you should have really good soil to start with. You may need to add some lime to balance the soil ph back to 6-7. If you have big thick leaves stalks that means too much nitrogen.
Showing 81 - 90 of 368 comments

Good day, can I plant the Australian brown onion throughout the year in South Africa? I want to maintain the monthly supply for my customers.

- Fanie Zulu

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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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