How to Prune large-leaved 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.

large-leaved rose · Rosa macrophylla
Grow in full sun with fertile, humus-rich, moist but well-drained soil. Tolerant of poor soils. 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. 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.