My potted dahlias go in the greenhouse. They came through last winter just fine. The ones in the ground I started from seed this year, and there are certain colors I'd like to put in pots on the deck next year. I suppose there's nothing to keep me from potting them up and putting them in the greenhouse now.
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My greenhouse is 6x8' I just went out and measured. I am not sure if I have already said what size it is. I know it has been a long time since I bought it. I used just a small inexpensive space heater, the kind that is normally used inside a house. I bought a temperature sensitive outlet that keeps the space between 36 to 42 degrees, if I remember right. It seemed to work the way I wanted it to. I had put blankets over the top on the greenhouse during last winters blast of cold. It was less than freezing for the best part of 2 weeks I think in December of 2009. The blankets were able to retain enough of the heat to keep all the pot of geraniums from freezing. I had no problems with overwintering the plants out in the GH. They continued to bloom for most of the winter and on into the spring. It didn't help that it was so slow this year to warm up.
I still need to pull the begonias in tomorrow before the temperatures really get cold. I don't know whether or not I will dig up dahlias or not. I have never had great success with digging them up. They have always rotted on me. For many years I have had them re-grow as long as I just leave them where they are planted. I do worry a bit about the dahlias that are in some of the larger pots just because they are more prone to freezing. I also will need to dig up the Canna bulbs tomorrow, and get them set for the winter. I left all of the summer bulbs stay where they were, so that they will have that first frost, so as long as I get them in tomorrow I think I will be okay with everything.