Hardening off?

greenhousechik(z5b MI)May 29, 2008

My Dahlias are in an unheated greenhouse. Do I need to harden them off before planting outside? Temps can get down to 35 in the greenhouse at night and I keep it at 90 degrees during the day. I didn't harden them off last year but I'd like to make sure. I have 175 in pots with pro-mix. Most are ready to go into the ground. TIA!

GreenhouseChik

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jroot(5A Ont. Canada (near Guelph))

Hardening off involves not only the temperature, but also and primarily the degree of radiation from the sun. Yours will probably harden off faster than those started indoors, but I think that the glass in greenhouses also diminishes the amount of radiation the plants receive indoors.

If I were in your shoes, I would harden them off for a few days in filtered light outside. I had almost as many pots are you have so I know the anguish of moving them all.

Fortunately, I think we are over the risk of frost here in Southern Ontario, but I will still be watching with care.

John

    Bookmark   May 29, 2008 at 5:13PM
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