I can tell you that any of the Benardella roses (Show Stopper and Power Point) are bred specifically for exhibition form, are not stingy, and are at least hardy to my borderline zone 7a/6b area. I would expect that they are hardy throu zone 6, but I can't guarantee.

No pruning now. You want to prune in late winter/early spring when the forsythia (yellow flowering shrub) is in bloom. In this area, it would be sometime from late March to mid-April. No more fertilizing either (that should have stopped in August). And just as an FYI, "miniature" refers to the size of the bloom, not the size of the plant. I have a couple of minis that will top out at 5' tall this year (they usually range from 3' - 4' tall). Some varieties are smaller, some larger.

The advice you read in rose books to prune back roses to encourage growth is more relevant for hybrid teas to encourage show-type blooms and not at all necessary even for them. You can prune any rose to try to encourage it to grow into a pleasing symmetrical shape once it gets big enough, and certainly deadheading (cutting or pinching off dead blooms behind the flowers) or a periodic haircut of the outermost couple of inches of branches (if you're lazy like me) can jumpstart a rose into increasing or continuing the blooms, but it's totally not necessary. In our cold zones, some people don't realize that Knockouts can lose branches to winterkill as much as any other rose, so you have to prune out the dead wood or they look unsightly pretty quickly. I spring prune all 75 Knockouts at my church every year now after they posted a pitiful note a few years ago that their "no care" roses looked awful. All they needed was the dead wood taken out, but that is all they need yearly and they bloom more or less all season, though you can see the dead blooms after a while and they slow down as they have more dead than live blooms. I'm just not willing to commit to deadheading or edge trimming all season for that many roses not in my own yard, and they do fine. Bottom line is I'd let them grow and do their own thing, particularly in zone 7, unless you enjoy the puttering about with roses. Cynthia

You could still go ahead and prune out anything that is dead, or so obviously skinny as to be useless, especially if it is cluttering up the center of the bush where it may encourage disease. That said, if you can't perform this pruning without damaging the new growth I would skip it and concentrate on treating the roses right the rest of the year (fertilizer andwater) in order to encourage new canes.