How to prune bougainvillea 'barbara karst'

After each major flowering flush; main prune late winter (frost-free climates). Cut flowered lateral stems back to 2–4 nodes from the main cane framework. Remove any dead, crossing, or inward-growing stems entirely. For renovation or size control, reduce the entire plant by one-third to one-half in late winter before new growth surges.

After each flowering cycle (2–3 times per year in warm climates). Bougainvillea 'Barbara Karst' needs firm pruning to control vigour and maximise flowering, as blooms appear on short lateral spurs off mature wood. Prune after each major flowering flush. In frost-free gardens, prune in late winter. Wear thick gloves — thorns are vicious. Avoid pruning in cool or dry periods as stress reduces flowering.

Cut flowered lateral stems back to 2–4 nodes from the main cane framework. Remove any dead, crossing, or inward-growing stems entirely. For renovation or size control, reduce the entire plant by one-third to one-half in late winter before new growth surges.