Furcraea foetida (Mauritius Hemp)
Originating from South America and the Caribbean,
it has been widely cultivated for fibre (not in KZN).
This species can grow in very shallow soil
(even as epiphytes on other trees), and is capable of
invading roadsides and steep
More info at : http://www.sanbi.org/information/infobases/invasive-alien-plant-alert