Bougainvillea need to be trimmed to maintain their shape. However, be aware that they flower along their long branches, so aggressive pruning of new growth will reduce their color. The best approach is to prune in the autumn, after the growing season is complete, so it will bloom from next season’s new growth

Use branch cuttings with a rooting hormone in the spring, with bottom heat provided. Bougainvillea are not easy to propagate by most home gardeners, so several attempts may be necessary