Elena, it is the crown that you need to be concerned about, it can be dead even if the roots still look OK. If the crown is firm then it may well come back. If the crown is dead (rotten) right through then it won't survive, even if the roots look good. I imagine, though, that you're including crown collectively when you say roots?
I purchased 'Beautiful Edgings' by mail order in 2014 and it arrived in fall and I don't usually plant here in fall because of the severe winters. I was rather worried because of that late planting, and it was a particularly nasty winter. Not only did it survive but it flowered last year. So it's pretty tough.
