From Central America and the Pacific islands, this perennial climber comes in both a white-fleshed and, more recently, an orange-fleshed variety.
It has entire, toothed or 3-lobed leaves and flowers with a lavender to pale purple tube that is darker on the inside.
Plant cuttings in rows 3 ft (1 m) apart in soil that has been fertilized and dug thoroughly; keep the young plants clear of weeds and water well while the tubers grow.
Harvesting ranges from 16 weeks to 40 weeks after planting.
Position: Sunny, Semi-Shaded
Cultivation:They prefer moderately fertile, well-drained soil and a sunny position.
Care should be taken when choosing species, as some can become extremely invasive in warm districts.
Propagate from seed which has been gently filed and pre-soaked to aid germination, or from cuttings (for perennial species).