How should i protect verbascum in winter?

hallo,

i have one enormous verbascum - winters around here can be -15 and i wont be here. how should i wrap up this lovely thing so it survives winter or should i wrap it up at all? Last year's winter was -20 and i had a verb... i hadnt noticed and it survived all on its own in the open.
What should i do?
thanks, karaman

 

Enclosing it in a wrap might encourage dampness and mildew ; if they've survived -20 I shouldn't worry too much !

 

thanks PaulB3, on reflection i think you are dead right! will make my life easier anyway having to worry about one less plant..... cheers, karaman