My Brugs are potted and about 6yrs old. Usually I'm able to drag them into one of the greenhouses for the winter but this year they put on a growth spurt and they're now towering over the top of the 8' greenhouses. I figure I've got two choices. One is to mulch them really good and hope for a warm winter. The other is to prune them really good so I can get them inside. I've never pruned them so I'm looking for some help on how that should be done.