How does PP respond to pruning back mid season?

An underrated rose cultivar for a Zone 3 climate and it can even survive (crown hardy) in a Zone 2 one for many years. Although it's similar in appearance to 'Morden Centennial' (it's one its parents), the flowers of this cultivar aren't as double but repeat better, and bloom well into fall. Because the shrub can get quite tall (2 metres in a Zone 3 climate), it's suitable as a Pillar rose grown against a wall of a house or a fence. The shrub is very attractive in late summer and early fall with its combination of bright pink flowers and orange-red hips.