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

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
25 Oct 18, Mike (Australia - sub-tropical climate)
Read the guide here. Plant first half of the year - probably after Feb - summer probably too hot.
18 Oct 18, Malcolm Langley (Australia - sub-tropical climate)
I planted onions last season and thined out where necessary and had a reasonable crop.this season l did it a bit differently. I planted the seeds into pots and then replanted into the ground so that I didn't waste any by thinning out. The seeds used were the from the same suppliers and were brown onions as before. This season they are growing well but most of them have very thick stems and seed pods are formed. The onionbulb in lots of instances is not developing .am l doing something wrong? Mal.
23 Oct 18, Mike (Australia - temperate climate)
I had this problem this year. First time I had grown onions. I put it down to too rich a soil. Maybe less N applied. And probably back off the watering a bit when they have grown for say 4 mths.
06 Oct 18, Wayne (Australia - temperate climate)
Onion Red Odourless: Planted sixty seedlings in April which have been growing well but are now going to flower and bulbs have not formed. (Adelaide Hills)
07 Oct 18, Mike (Australia - sub-tropical climate)
I grew onions for the first time this year. Mixed success. White ones. Some formed bulbs some didn't - good health plants - probably too much N. Onions can take 6-8 mths to grow.
09 Sep 18, Sally (South Africa - Summer rainfall climate)
Which varieties of onion can I plant in Johannesburg now. From seed
Showing 161 - 170 of 368 comments

I have geown onions for sometime with very ittle success, why don't the bulbs swell?

- Anonymous

Please provide your email address if you are hoping for a reply


All comments are reviewed before displaying on the site, so your posting will not appear immediately

Gardenate App

Put Gardenate in your pocket. Get our app for iPhone, iPad or Android to add your own plants and record your plantings and harvests

Planting Reminders

Join 60,000+ gardeners who already use Gardenate and subscribe to the free Gardenate planting reminders email newsletter.


Home | Vegetables and herbs to plant | Climate zones | About Gardenate | Contact us | Privacy Policy

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.
We cannot help if you are overrun by giant slugs.