Cassia javanica, also known as Java cassia, pink shower, apple blossom tree and rainbow shower tree (Filipino: balayong), is a species of tree in the family Fabaceae. Its origin is in Southeast Asia, but it has been extensively grown in tropical areas worldwide as a garden tree owing to its beautiful crimson and pink flower bunches.
In India, C. javanica flowers in April/May and fruits and sheds its leaves in December. In Thailand, C. javanica flowers between Feb and April. In the Philippines, C. nodosa or C. javanica nodosa flowers between February until the summer season. In East Java, C. javanica flowers between October and December and fruits in the dry season.
Cassia javanica is one of Thailand's Nine Auspicious Trees and is said to bring good luck, ensure continued high rank and afford victory. Its flower is the provincial flower of Chainat Province, Thailand. The subspecies native to the Philippines, locally called balayong, is honored through the Balayong Festival in Puerto Princesa, Palawan. The flower is a historical symbol of feminine dominance, female beauty, and love in the language of herbs among the locals.
It is used medicinally as a substitute to Cassia fistula for treating constipation, colic, chlorosis and urinary disorders. Its leaves are effective against herpes simplex and the bark of C. javanica is one of the ingredients in ayurvedic and other traditional medicine antidiabetic formulations. C. javanica yields a lightweight to heavy hardwood that is used for general construction, furniture and cabinet making. The bark of C. javanica is used for tanning in the leather processing industry.