How to Prune stiff bottlebrush?
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.

stiff bottlebrush · Callistemon rigidus
Grow in a sheltered position in full sun with a moist but well-drained soil
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.