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

Post a comment or question Display Newest first | Oldest first, Show comments for USA | for all countries
07 Feb 24, (USA - Zone 5a climate)
Hi, it means to take the seedlings you've grown from seed, and plant them in the ground or bigger pots.
Reply or Post a new comment
08 Feb 24, (USA - Zone 5a climate)
Thanks
Reply or Post a new comment
26 Dec 23, alfred rockhold (USA - Zone 6a climate)
i live in wv
Reply or Post a new comment
01 Mar 23, Susan (USA - Zone 6b climate)
Can I direct sow intermediate onion seeds in fall in a raised garden bed covered with leaves and over winter them. Zone 6b
Reply or Post a new comment
29 Jan 23, Gladis (USA - Zone 10a climate)
What variety grows best in zone 10a (Southern California)?
Reply or Post a new comment
07 Jan 24, Lisa (USA - Zone 10a climate)
Any Short Day onions. Google "Short Day Onions". I also live in Southern California and just received my onions sets from Dixondale Farms.
Reply or Post a new comment
29 Jan 23, Ron Holt (USA - Zone 7b climate)
I would like to grow onions (sets) in my garden this Feb. 23 to be harvested as mature onions in about 6 months. I would prefer sweet onions. Can you suggest a a particular type ? Do I need to buy heated onions? Thanks, Ron
Reply or Post a new comment
19 Jan 23, Sharon Burke (USA - Zone 7b climate)
I took a kitchen scrap from a yellow onion and now I have roots what kind of soil should I plant this in for indoor in January please and thank you
Reply or Post a new comment
24 Sep 22, digna carwell (USA - Zone 10a climate)
Hello I lived in 10A zone I would like to know when is the best time to grow , onions , garlic, carrots and mist vegetables? Thank you in advance for your response.
Reply or Post a new comment
03 Oct 22, (USA - Zone 4b climate)
Check the planting guide for each crop.
Reply or Post a new comment
Showing 11 - 20 of 44 comments
See comments for all plants

Onions can be raised in seed trays or punnets and transplanted when about 10-15cm tall. They should be planted with just the roots covered. If sown direct, the emerging plants may need thinning. I have been successful with both methods for brown and red onions and with spring onions from seedlings.

- Liz

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.