How to Prune Rubus formosensis?
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.

Rubus formosensis · Rubus formosensis
Train to wires on the sheltered side of a fence or wall, in any fertile soil in sun or partial shade. Alternatively, allow to grow freely into 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.