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Hi Ginny May, as far as I know they are not winter hardy.
As they are Succulents cut off the piece you want for a new plant and let it dry for a few days, then pot it up in gritty compost.
I'm in Cornwall. Yes I have grown aeoniums in the ground and kept there over winter. Sometimes it works sometimes not. Often it's been a late spring frost that catches them.
In nearby Perranporth in a garden overlooking the sea a mass plantImg of aeonium swarkskopf survived at least 3 years.
I keep one plant outside in a pot but always bring a plant or two indoors too.
It may be better to let cuttimgs dry out first but I never do.....they are taken and inserted immediately. I reduce the height and take several cuttings from this reduction. Spring through to late summer
Jasmine......they usually branch naturally as they get older. If you want it to bush out, take out the growing point and use as a cutting. Depending where you are situated, it might be a better idea to overwinter your plant as normal and pinch out next year...June or July when it is warm enough for the parent to put on new growth and the optimum time to root your cutting.
I've seen these each year at Trentham Gardens. I'm pretty sure that they are in pots which are buried into the ground and then dug up each year and taken indoors.
I live in North Cornwall and usually bring mine into the conservatory each winter but they often lose their leaves and look pretty scrappy before reviving for the summer. Got a new (unheated) potting shed last year and decided to put them in there over winter. Oops, bad move. They all got frost damaged really badly from a really short stint of frosty weather. I have brought them back into the conservatory but so far, no signs of life. I think I have lost the lot for good which is a shame.
Same for me SFord - they hated being in the greenhouse overwinter. Have perked up a lot after being brought inside. I had to cut off the tops of 3 of 4 of mine (I am rooting those) and removed part of the stalk (already seeing new growth). Weird as I kept mine above freezing apart from one night when the paraffin ran out and 3 stalks developed rot from frost damage.
Glad to hear that yours seem okay Blairs. I too cut the tops off and have tried rooting them (and keeping the bottom parts too in hope!).
Needless to say, wont be keeping them in the potting shed for winter again!!
Quite a difference between North cornwall and far west where I am SFord. Aeoniums often survive outdoors over winter for me.
Cutting the tops off for cuttings in spring or summer provides extra plants and makes the donor plants bushier