Last summer knocked off a branch from a geranium (or as the call it in UK, Pelargonium).
Here is the branch. It was lying around more or less in the shade for about a month, while I had other things to concern myself with.
It stayed green and alive looking, somI thought I would use it for cuttings. I cut it into four pieces, using a sharp knife.
Then Imstuck them all into a four inch pot with potting soil. Not a special rooting medium, not peat moss or sand, no rooting hormone, no scoring the sides. Just stuck them into the soil.
Then I watered just like any indoor plant. They are in my sunroom.
Last month, they had grown quite a bit and were crowding each other. I took them out of the container, separated them, and pruned back for better branched plants. Here they are now.
They are growing very nicely. By Spring, I'll have four nice geranium (pelargonium) plants, nice size and shape, probably in bloom.
I think these are one of the easiest plants to grow, take cuttings, overwinter. They are very rewarding.