One thing that strikes me about your box, Waterbloke, is that there does not seem to be any ventilation. Fresh air is as important to the geraniums as is being kept frost free. My suggestion would be to watch the weather forecasts carefully and only put the lid on when frost is forcast. I suppose that you should normally keep the cover raised up above the box to keep excessive rain off the plants.

Thank you for the comments about the ventilation of my box but I still don,t know what to do about the plants themselves do I leave them as they are or cut them back?

I don't know about that, Wb, someone else will answere shortly.

Definitely cut them back to the last leaf shoots, and over-winter in a dry and frost-free environment, with some light. Don't water unless they are dried out to touch, or they will rot or succumb to white fly. My father has successfully kept his pelargoniums going every year for five years following this approach. When it starts to warm up, add a little light feed occasionally, still bringing them indoors over night for a while. Thus gradually introducing them back to the outdoors. Once permanently outdoors, feed regularly, to induce flowering, but they will stand drought, and love the heat and warmth of the summer.

You could try taking some cuttings from them for insurance. Take a few cuttings off a stem, 3 or 4 leaves long and put them in a damp gritty compost and leave them on a bright windowsill. Keep the soil quite dry or else they will rot.

Myron, how can you put them in damp compost and keep them dry?

Oh Steragram, what are you like? I do despair, LOL. What I meant was first put them into damp compost as it's difficult to pack the cutting in dry compost and it will get the roots, established. THEN keep them QUITE dry. I think you're pulling my leg? are you? Oh! I think you're humour is dry, love it, you are a cad. haha.