Sharon,
I don't think this white growth is anything to worry about. Some of my brugs do this all winter. They didn't get the message that they are supposed to be dormant, lol. I would say don't trim it, just leave them alone. You could put them in a window if you wanted to, but I would say just leave them where you can ignore them and just bring them out when they can go outside.
Shawn

I'm concerned about removing the cuttings from overwintering because they may start to grow and aphids will appear. I know I had aphid issues last year at this time. It's so hard to keep aphids under control not to mention far to early to put the brugs outdoors. We have lows at night in single digits and maybe 20's for highs. I'll coddle them for at least 6 more wks. in overwinterizing phase. Thank you for your advice, Shawn.

gramsharon

I'm with Shawn.. I would ease them to the light to allow them to acclimate.. but I would not trim them unless there is damage.. I have a couple of Banana's that I store under the house that are blanched when I bring them out..They do fine...
Congrats on the new growth and NO bugs.. That can be quite an accomplishment..LOL
Kylie