Senior Member
Posts: 229
Joined: Tue May 11, 2010 1:18 am
Location: Central Connecticut

How long can onion seedlings stay in their cells?

I have one of those 72-cell self-watering seed starting trays, and the cells are pretty small, maybe 1" wide by 3" deep. And I thought this would be perfect to start onions. Is it?

My question is, how long can the seedlings stay in there before they have to be transplanted?

I guess the important question is when does the bulb start form? Cuz there won't be any room in this tray.

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Super Green Thumb
Posts: 7480
Joined: Mon Jan 19, 2009 3:20 am
Location: Northern Utah Zone 5

I would plant them out when the stem is about the size of a stick match. They won't bulb until the days are of the right length. June probably. They will be pretty good size by then.
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-

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