Answer:Bougainvilleas appreciate regular water during the growing season, especially in central California where summer weather is hot and dry. The bougainvillea plants that have almost naturalized in San Diego and Hawaii have done so because of the humidity inherent in those areas. That's their secret to vigorously growing (and blooming) plants! Bougainvilleas should bloom almost continually during the growing season, but that's not to say that individual flowers will last that long. Generally, new flowers are produced in such abundance over a long season that gardener's rarely notice when older flowers die off and new ones replace them.
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