Tradescantia zebrina

A fast, mat-forming, slightly succulent trailing herb (formerly Zebrina pendula) native from Mexico to Colombia. It grows in thickets, on stones and along riverbanks in both shade and open spots, mostly at low elevations. It is naturalised and invasive in moist, shady places across the tropics and subtropics, including the Pacific islands, Asia, Africa and Australia, so many wild-looking records are escapes. Indoors it wants bright light for good silver-and-purple colour, steady moisture and warmth.