How to Prune prickly wild 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.

prickly wild rose · Rosa acicularis
Also known as: Arctic rose; bristly rose; prickly rose
Grow in fertile, humus-rich, moist but well-drained soil in full sun or part shade. Suitable for hedging and wildlife gardens. 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.