Panicum virgatum 'Hanse Herms' German speaker needed

I've dug up and potted an established clump of this grass and I'm wondering if I should protect it over winter. I've done a web search re hardiness and just about everything is in German. My German is more or less nil.

Can someone help me out here please either from personal experience or doing the search on my behalf.

Google will do this for you. Google can translate text from any language, into any other. Just get the text you want, and paste it here:

http://translate.google.co.uk/?hl=en&tab=wT#de/en/

You may be able to simply put a website address into that box.

Thanks Georg. I didn't know that

pretty dim of me really when it says at the top of the screen 'This page is in German, do you want to translate it.'

Grasses really are best split and repotted in early Spring. The roots are now going dormant so the plant will sit and do nothing over winter. If ket too wet then it will rot.

Thanks Berghill. I've put it inside. I disturbed the roots as little as possible and put it in a big pot. It had a good watering in yesterday and I put it inside this morning. It had to come out of the soil to make way for new drains otherwise I would have left it alone.

I've hacked around at some asters and chrysanths, I ran out of pots that were big enough for large clumps. I've put some of each in the greenhouse (cold) and left some outside (space issues). 

I usually do what I want, when I want, but last winter bit me rather hard. I'm being more careful this year. Hence the questions.