Pelargoniums (or Geraniums) in Winter
Winter is coming and your pelargoniums (commonly known as geraniums) are still outdoors. You should bring them indoors when the first frost appears, as although they may resist a small frosty spell they will not survive a cold winter.
Remove all the dead leaves and those which are wilted or dying. Fold the stems back by about a third and keep the ends to make cuttings for the following year. Put your plants in a cool, ventilated place (between 5 and 10°C), with a light souce if possible, and water as little as possible. Don't fertilize during the Winter period.
Note that ivy-leaved geraniums are often less resistant than zonal geraniums. They demand more exposure to light.
If you can't bring your pots or garden boxes indoors, place them beside the walls of your house. Cover them with bubble-wrap or cardboard and put a winter cover on the leaves. Don't forget to ventilate by taking this cover off during the fine days at the end of Winter, before removing it permanently when the good weather comes back again.