Baby Onions in a Greenhouse?

Crab-Grass(5)February 19, 2014

I started some onions from seed February 5. they have all germinated and the seedlings are 2-3" tall. i have them under generic fluorescent bulbs. My indoor growing space is extremely limited and I was hoping to start some pepper seeds soon. So I was wondering when it would be safe to move the onion seedlings into an unheated green house outside? It isn't fancy- its a four shelf greenhouse covered in green plastic that I bought at my local garden center. I can vent it if necessary. I live in the Denver area of Colorado so our temps can go from sub freezing to 70 degrees in the same week! I would also probably bring the seedlings inside or move into the garage at night, especially if there's snow in the forecast. Any advice?

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The main thing is to avoid exposing the seedlings to temps below 45 degrees. They will love going out on sunny days as long as they are protected from wind.

I also need my onions out of the way before I start tomatoes and peppers in mid March. There always comes some crazy cold in April when they all have to come inside, and the bathtubs are full of seedling flats.

    Bookmark   February 20, 2014 at 8:58AM
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gjcore(zone 5 Aurora Co)

In the Denver area most nights are still going to be in the teens or twenties and certainly we haven't seen the end of even colder nights. The little greenhouse isn't going to retain enough heat most nights for onions until later in the season. I'm not going to move my onions out into a cold frame until the nights are more consistently in the 30s. Not that there's anything consistent with Colorado weather.

    Bookmark   February 21, 2014 at 10:06AM
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thanks guys for the advice! Think I'll move the onions outside when the days are warm and sunny and then bring the babies inside at night.

    Bookmark   February 21, 2014 at 11:12AM
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