Piper retrofractum (Javanese Long Pepper)

Piper retrofractum, commonly known as Javanese Long Pepper or Balinese Long Pepper, is a perennial climbing or scrambling plant in the Piperaceae family, native to Southeast Asia and widely cultivated in Indonesia and neighboring tropical regions. Its slender stems bear glossy, ovate to lance-shaped leaves and characteristic cylindrical fruiting spikes composed of numerous tiny fruits fused into a compact structure. The spikes are harvested while still immature and green and may be used fresh or dried, becoming reddish to brown as they mature. They have a hot, pungent, aromatic flavor and are used as a spice, particularly in Southeast Asian cuisine. Piper retrofractum is closely related to Indian Long Pepper, Piper longum, and the two species are sometimes confused in cultivation and trade.

Javanese Long Pepper grows best in warm, humid tropical conditions, with bright filtered light to partial shade and fertile, organic-rich, well-drained soil. Regular moisture encourages vigorous growth, but waterlogging should be avoided. It is suited primarily to USDA Zones 10-11 and requires protection from frost and prolonged cold. The flexible stems can be allowed to scramble or provided with a support for climbing, making the plant suitable for tropical gardens and large containers. Plants can be propagated from seed or, more conveniently, from stem cuttings.