Ask a Question forum: Planting onions:

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Jan 26, 2017 10:31 AM CST
How close together do you plant onion sets? What should be the average temperature when they are planted?
Name: Daisy I
Reno, Nv (Zone 6b)
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Jan 26, 2017 11:16 AM CST

Planting time depends upon where you live. In California, I planted them in the fall. In Reno, I plant them in the spring. Your local onion garden center will sell them at the right time for planting.

They will also sell onions approriate for your area (Short day vs long day).

Leave about 4 inches between plants, assuming that your onions will end up 4 inches wide. Six inches if you think they will be monsters.
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Name: Philip Becker
Fresno California (Zone 8a)
Jan 26, 2017 11:25 AM CST
When the stores get them in. I've never had luck with sets, except to grow into green onions. Hears how to get some good onions #!!! It would be good to know where you live !!! When time to plant. Plant seeds, SEEDS in row. Perty close together. Usually in fall. They take about 21 days to germinate. Then about this time of year, at least hear. When there about the size of a pencil. Thansplant them 6 to 8 inches apart. 8 inches or more for bigger onions. Closer = smaller.
Ask your nursery when/or if they get transplants in. Or order some online.
They have some onions that mature quicker than others, so its not to late for you to start some seeds. Depending where you live, again.
Anything i say, could be misrepresented, or wrong.
Name: Sandy B.
Ford River, Michigan UP (Zone 4b)
(Zone 4b-maybe 5a)
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Jan 28, 2017 10:23 PM CST
Welcome to NGA, @janetsr !

I agree with planting the sets about 4 inches apart; although I get decent-size onions from sets, I've never gotten any super-large ones except from plants. You can also plant them closer together and thin as they are growing, to use as green onions.

I plant the sets around the first week of May, which is 3-4 weeks before planting my tomatoes outside.
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Name: Elaine
Sarasota, Fl
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Jan 29, 2017 10:21 AM CST
We really do need to know where you are in order to advise you on when to plant. If you could fill in your profile with city/state/country that would be most helpful.

As to spacing, if you have really great fertile soil, 4in. spacing is good. Less fertile, like the clay soil that we plant in, at my daughter's place in Salt Lake City, I go 6in. for the big, sweet onions.

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