Botanical Name: Bougainvillea
Cold Hardiness Zone: 10
Bougainvilleas’ natural habitat is equatorial where day and night lengths are almost equal. Bougainvilleas in these areas tend to bloom year round, but in North America, best blooming occurs when the night length and day length are almost equal (in spring or fall). In winter, blooming is better than in the dog days of August because of night length. Also, some cultivars are triggered to bloom after a rainy season followed by a dry season.