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Hardening off?

Posted by greenhousechik z5b MI (My Page) on
Thu, May 29, 08 at 12:40

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!

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RE: Hardening off?

  • Posted by jroot 5A Ont. Canada (near (My Page) on
    Thu, May 29, 08 at 17:13

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.


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