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Annual geraniums
I live on the south coast about 15 miles from Brighton so it's not too cold as a rule but we often have a bit of snow in winter.
I like annual geraniums because they always grow well in my shade garden, I have a lot of trees.
Trouble is they are supposed to be annuals but have come back 4 years running from the plants I left in the beds over winter and have grown massive. I had to dig them up this year because they were swamping everything. I put some new ones in, a different colour. They were not leggy but really bushy.
I am mystified how annual geraniums do so well despite english winters. Has anyone else found they can't get rid of them. Just so we're clear what kind of geraniums I'm talking about they are these:

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Geraniums are fairly hardy - think of the number of folk who overwinter them in a frostfree g/h and then take cuttings. I guess you don't get many winter frosts being on the south coast and close to the sea?
They're pelagoniums and they're perennial.
That exhaiusts my knowledge on the subject
In the sticks near Peterborough
Well we do get frosts but certainly not the harsh white frosts that we used to get in Bedfordshire.
They die down completely and what i left above ground looks dead but then pop up again around June.
With all the trees in the garden and 6 foot fencing all round, plus they are sheltered by the other plants around them I suppose it must be like overwintering in a cold frame.
my mums in eastbourne and hers always survive the winter too, ive got white ones planted for the first time this year and they will be staying in the garden over winter.
Excellent
We are 9 miles from there in Seaford,