Greenhouse newbie! Help

I got a small greenhouse for the patio. It's probably 5 feet high, 3 feet wide. What do I need to make sure the plants are comfy? I have no idea what I am doing. I want to use it to germinate seeds.

Best thing to do is to read through the greenhouse forum, until someone can answer your question. Lots of good info in here. They'll need to know the zone you are in, your average temps (day & night), amount of sun on your patio, etc.

I don't recall for sure, but spring vegetables germinate at about 45*-50*, summer vegetables and most flowers at 65* or higher. Once your seeds have germinated, then you have to make sure you greenhouse doesn't get too hot during the day.

Have fun!

I suspect to make your plants "comfy" bb, you're going to have to worry far more about keeping them cool than you're going to have to worry about keeping them warm. "Fo't Wuth" climate isn't that much different from Mansfield, where I did my Texas gardening stint (it was still open range, then!), and I learned about the stultifying effects of heat. Lordy, that Texas sun is HOT! In February...don't even think about July and August! What plants are you trying to grow? I may be able to help if I knew that...I did manage to work out some tricks to beat that merciless sun... BTW, is Neil Sperry still active down there?

I agree with what everyone's said about needing to keep things cool, I think that's going to be your biggest challenge. I have a 5x9 greenhouse, and on a 65-ish degree day here, if I left the doors and vents closed, the greenhouse would easily hit 110, and that's way too hot for seedlings (and my GH doesn't even get sun during the hottest part of the day). If your nights are still chilly, then I'd get some heat mats and put your seedlings on those. I don't think your GH is big enough to get a heater in there without losing a lot of space that you probably want for plants, so heat mats are the way to go if you need more warmth.

Get a good book like Shane Smith's Greenhouse Gardener's Companion and read up. That book is well worth the money.