Answer: Rainbow Shower Tree is Cassia fistula x C. javanica. It is a medium to large size tropical tree, to 40ft, and is common in parks and on streets in tropical regions. The tree is very drought tolerant and grows best in full sun, hot, and dry conditions. There are several different varieties of the rainbow shower tree, each having various colors of flowers, often maturing from one color to another. This tree is a horticultural hybrid, originating from Hawaii; the rainbow shower tree is a sterile hybrid.
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