How to Prune beautiful-leaved bramble?
Once well established, cut some older stems down to the ground in late autumn to make room for new, each year. Tie these in to their framework if necessary.

beautiful-leaved bramble · Rubus calophyllus
Train to wires on the sheltered side of a fence or wall, in any fertile soil in sun or partial shade. Alternatively leave free-growing to form a mounded shrub.
Once well established, cut some older stems down to the ground in late autumn to make room for new, each year. Tie these in to their framework if necessary.