Several hybrids and numerous cultivars have been developed for use as ornamental plants. B. × candida is a hybrid between B. aurea and B. versicolor ; B. × flava is a hybrid between B. arborea and B. sanguinea ; and B. × cubensis  is a hybrid between B. suaveolens , B. versicolor , and B. aurea . There are cultivars producing double flowers, and some with variegated leaves. The cultivar B. × candida ' Grand Marnier ' has gained the Royal Horticultural Society 's Award of Garden Merit .