Which is the hardiest spring flowering camellia? I live in Sweden, 68km north of Stockholm usda zone 6b-7a and i would really like to have a camellia hedge or something like that.

How hardy is the williamsii camellia's(diration)? I've read that they should be very hardy but i dont know what the brits in sussex,cornwall,kent etc mean by that.

What about the snow, how much does it help the camellias to survive the winters?

About these winter's roses and so, who hardy are they and do they only flower during fall? I would like to have a camellia hedge that flowers during spring(i can afford some protection)

Thankful for answers