Bangle (Zingiber purpureum Roscoe.) is a herbaceous plant that grows in lowlands to highlands and is used in traditional Indonesian medicine, especially its rhizome. This plant has properties to treat fever, stomach ache, and gout, and contains saponins, flavonoids, essential oils, tannins, steroids, triterpenoids, and antioxidants. Plant growth regulators (PGRs) such as gibberellin and IAA can…