Piper betle aka Betel

Piper betle, or betel pepper, is a shrub that climbs. It stays green all year. Its family is Piperaceae, the pepper family. Kew lists its native range as Indo-China to Malesia. Useful Tropical Plants suggests it first grew in Malaysia. That source says no truly wild plants are known today. People have grown it for more than 2,500 years. They have long used its leaves in chewing mixes. The leaves also have a long use in folk medicine.

The plant grows fast and forms long, woody stems. Its listed height when grown is about 16 feet [5 metres]. Stems can reach 66 feet [20 metres] in length. Roots that grow from stems are called adventitious roots. They help stems cling to nearby plants or supports. Growers also train vines up canes under shade covers. The plant keeps its leaves all year. Good growth can yield larger leaves with less sharp taste. The source also shows flowers on a spike.

This vine suits the warm, wet lowland tropics. It favours mean yearly heat levels of 22–27°C. Its reported range of tolerance is 17–31°C. It needs shade, moist air, and shelter from wind. Soil should hold plenty of water but drain well. Deep, loose loam or clay suits it. The soil should be rich in organic matter. The sources give different advice on soil pH. One favours acid soil. The other favours neutral to slightly alkaline soil. Neither account sets a cold-hardiness rating.

Growers take cuttings from the tips of upright shoots. They bury the lower nodes, where leaves join stems. They tie new growth to supports. With good growth, leaf harvests can start after about 18 months. Vines may then yield leaves three or four times yearly. Growers keep picked leaves out of sunlight to save their scent. Leaf quality varies with its place on the vine. The source says upper leaves yield more essential oil, too.

Betel leaves form part of a chewing mix called a quid. This mix can also hold areca seed and lime. The leaf and areca seed come from different plants. Chewing these mixes brings a risk of mouth and tongue cancer. This warning concerns the mix. It does not prove that leaves alone are toxic. Asian folk medicine uses the leaves, roots, and seeds. Reported uses include leaf dressings for wounds. They also include heated leaf poultices, or packs. These records show past practice, not proof that treatments work. The leaves also yield a scented essential oil.