How to Prune Chilean bamboo?
Remove weak, dead, damaged or spindly stems in spring and to show off stems to best effect. Cut out any flowering shoots promptly to discourage more from forming - see bamboo cultivation

Chilean bamboo · Chusquea culeou [Small/Dwarf Form]
Grow in fertile, humus-rich, leafy, moist but well-drained soil in sun or partial shade, sheltered from cold, dry winds.
Remove weak, dead, damaged or spindly stems in spring and to show off stems to best effect. Cut out any flowering shoots promptly to discourage more from forming - see bamboo cultivation