How to Prune glaucous dog rose?
Keep single-flowering shrub roses lightly pruned, removing dead, diseased, crossing and weak growth. Thin a few old unproductive stems if crowded. Prune in late summer after flowering.

glaucous dog rose · Rosa caesia subsp. vosagiaca
Grow in fertile, humus-rich, moist but well-drained soil in full sun or part shade. Mulch with well-rotted organic matter in late winter or early spring, and for best flowering apply a general rose or shrub fertiliser in early spring and again in early summer. Tolerant of poor soils and suitable for woodland planting. See rose cultivation
Keep single-flowering shrub roses lightly pruned, removing dead, diseased, crossing and weak growth. Thin a few old unproductive stems if crowded. Prune in late summer after flowering.