The Red Shower tree is native to Sri Lanka and India, according to Floridata.com. There are many other plants in the Caesalpinioideae family with the Red Shower tree, including the Yellow Shower Tree. According to the website of the botany department at the University of Hawaii, "the Caesalpiniaceae are mostly tropical and subtropical trees and shrubs comprising about 150 genera and 2,200 species." The Cassia marginata is just one of these family members.
The Cassia marginata is ornamental; it provides a splash of bold pinkish red color anywhere it is planted. Add to this the drooping, dramatic arrangement of its leaves and branches and the Red Shower tree provides a bright statement in any landscaping plan. According to Floridata.com, "Red cassia is unusual with its pretty rose colored flowers;" most of its plant relatives have yellow flowers instead. This unique nature of Cassia marginata makes it a particularly attractive plant specimen.
The Red Shower tree is a tropical plant, so it is only likely to grow in very warm climates. According to Floridata.com, gardeners can grow Cassia marginata in USDA zones 10 and 11; these zones are located in the very southern-most areas of the United States, stretching east to west from the Carolinas to California.
According to Floridata.com, the Cassia marginata needs partial to full sun and well-drained soil. This tree will need regular watering as well. To plant more Cassia marginata, soak the seeds overnight and then plant them in this type of environment. The more closely you can mimic the tropical home of this Red Shower tree the more likely you are to be rewarded by its vibrant blossoms from year to year.