Water guava is a plant in the guava tribe or Myrtaceae originating from Southeast Asia. The water guava is actually different from the Semarang guava (Syzygium samarangense), a close relative that has almost the same tree and fruit. Some of the cultivars are even difficult to distinguish, so that both are often named by the common name of water guava or just guava. Water guava is easy to plant and cultivate.