@megen som sagt är jag igen expert så jag skicka ett mejl till tyska humle shopen om hur man sköter rötterna under vintern, och fick svar.
"the best way to let the hops survive the winter-time is to plant them right now. Take care to plant the roots about 2-3 cm deep into the soil. The soil in combination with snow is the best protection for the roots.
Please do NOT put the roots inside your house during the winter. This will not be successful!
Hop will survive very deep temperatures, this is no problem! Frost is necessary for a good start in springtime. The problem (for most of the plants) is the changing of the temperature: relatively high temperatures on daytime, very deep temperatures over night. So, the best protection is the protection against sunlight. Under a cover of soil and snow the temperature is very stable on a specific level! "
::beppe