It depends to some extent what you are growing, as its not easy to see from the picture. More details?
Incidentally, I am wondering whether those plants on the second shelf down are getting enough light as they are very shaded by the big pots above. Again, what are they?

Yeah, this is an old pic, I have played around with putting bits on different shelves now to make sure they all get light but is so hard in a tiny garden :(
They are a mix of things like Delphiniums, Begonias and various mixed flowers like that, some Cat Mint/ Cat Grass. To be honest I cant remember everything but I planted them all very late as I don't really know what I'm doing but I just don't want them all to die.
Should I keep the whole lot inside but still in plenty of light (a conservatory maybe) to be on the safe side?

Hiya weejo,they are young plants grown from seed,I`m no expert but would advise you take indoors for winter.
I dont have a greenhouse but I have been successful growing cuttings that are in my kitchen in propergators.
I will not risc planting out until spring,so if I had young plants like yours I would take the safer option & take indoors,hope this helps,Kev.

Another option is to swathe the greenhouse with bubblewrap or fleece for a bit of extra protection. Or - if you have a spare cover for it, put the spare on over the one already there and pack between the covers with bubblewrap.

What you have is actually a coldframe (I have one). Yes they are called greenhouses but they offer no protection in severe frosts. Think coldframe and not greenhouse and that will help you decide what plants to put in it - at least in winter months (they get hot and humid in summer).

The Begonia is the only thing I would take inside though. Delphinium and the grasses will do fine outside in a border never mind being in a coldframe.

Great- thanks all, that's very helpful! I look forward to hopefully posting pics when they all flower!!
John

IN the ground they would be fine but in those small pots they might freeze. It would be good if you could pack some sort of insulation round them to protect the roots.

If they are big enough would you suggest putting them in the ground then?

No, plant them out in spring if they are small, otherwise they will probably just rot off. Make sure to open the zips on mild days or the gh will get too steamed up. I have one of these as well as a gh and it's very useful. Make sure it is out of the wind, though.Mine blew over twice recently!! Also, watch out for severe temp fluctuations in spring if the sun shines on it.

Mine blew away several times too, until I put a large concrete block on the bottom shelf. I agree don't plant them out now, its too late, but do insulate the pots if you can. You could put dry compost around the ones in the tray.