I got greenhouse this Valentine day myself, mine is 8x8x6 and covered with opaque tarp type cover with metal framing inside. Anyway I am planning to do similar move- I have indoor grown various perennial seedlings which are pushing now their plug cells. I put my greenhouse on sunroom terrace- second floor and have to say that wind on the bottom is significant. I also placed foam boards on the floor and sides, electrical blanket on the floor and covered it with 1 mil plastic sheet. Same as you I am planning to put my seedlings there. I did experiment with my columbine seedlings- weather was in high 30- low 40 and I left them for the daytime hours, no heat blanket- it seems was too stressful for my poor seedlings. You are in zone warmer than me so I think you will be safe to move your seedlings. Move them slowly, first couple days only for few hours if you can. Give them time to adjust and they will be good. For the night you can cover all trays with plastic covers.
I will have to wait another 2-3 weeks before my temps reach stable 50 daytime.

I watch this forum a lot and saw the post on the pop-up greenhouse and couldn't wait to check it out. I've been perusing various garden catalogs, etc., for something similar because I want to use it for raising my butterflies. In otherwords, put the pots of milkweed or whatever host plant inside the greenhouse with the caterpillars on them. This way, I can protect my eggs and caterpillars from insects and birds.

Love this idea, and this would really make a nice container for my tropical milkweed, Rues, thistle plants, etc. Instead of just feeding the caterpillars daily with the foliage and cleaning the containers I keep them in, I can just put them in the greenhouse and keep the floor clean of frass.

Thank you so much. Their prices look reasonable, but apparently they also use Home Depot as one of their retailers.

Susan

lindalana - Thanks for the good advice. I think I am going to set up the house and monitor the temperatures. I will probably add a heater for nights. Then ease the seedlings into them, like you said.

Susan - Yes, I got my Flowerhouse from HomeDepot.com for $99 plus tax, with free shipping! I was thrilled, needless to say. I'm guessing you would have to add supplemental heat for the butterflies, but the booklet that came with the house offered lots of good suggestions on heating, etc.

Squeakmommy,

I have a similar greenhouse (The Germinator, linked below) and I used it last year as well. I put mine on my deck for easy access although some cold air does come up through the floor. Mine has steel bars in it so I weight it down with bungees and barbells or else in a storm it would fly away. That's one thing to think about if you're not using the ground anchors.

I moved my hardier plants first last year and I did it on an unseasonably warm March day. You will definitely want a heat source. I use an electric heater from home depot with a thermostat. It isn't digital, you just turn it down when it gets to the desired temperature and then the heat comes back on when the temps drop. I get a little nervouse leaving it on all night outside but... the things we do for our plants, lol. You'll also want a little digital thermometer so you can monitor the temps and make sure they don't drop below 40. Good luck!

Here is a link that might be useful: greenhouse

Last spring I put my greenhouse outside fairly early. I put it against the south side of the house. We did have a few cool nights and I put blanets over top of it. Not one thing froze. Even my tomatoes.
Sheley

Thanks to everyone for your good advice! I am planning to set up my greenhouse tomorrow (after the big thunderstorms come through tonight!). I decided to put it down in the yard, against one wall of the house, facing south and east. It is so windy around here - we frequently have furniture blow off the porch - that I would feel better with it staked securely (which I can't really do on the deck).

I have a portable electric heater which I will be using at night, the kind that shuts off if it tips over. I think I will also put in some Christmas lights for a little added heat, and so I can see if I go out there at night, and because I haven't put them back in the attic yet - LOL! I plan to set it up and then monitor the temperatures for a few nights to see how it does, before I move my babies out there.

Oh, and I will be putting my roses that I have purchased but have not planted yet in there as well. They are all piled in the half bath and you can't even get in there!

I figured I would move about half my seedlings (that are ready) out at first and see how they do. I will probably ask for volunteers - some of my hollyhocks look pretty brave!

I'll let every know how it turns out.