The seven weeks fern, as Rumohra adiantiformis is commonly known, is an indigenous fern species. It is also indigenous in many other countries worldwide, particularly the tropics in the Southern Hemisphere. Usually sheltered among rocks in moist places of forest shade, it is also happy in wetlands.
Large, leathery fronds grow from slender, scaly rhizomes, forming clumps.
This fern is popular in gardens as a hardy evergreen, easily and commonly cultivated in sheltered spots. In Brazil many people cut the fronds for the flower market. The dark green fronds last well in water, for (seven?) weeks after being cut. In colder countries it has become a houseplant, cared for indoors.
Some indigenous people of southern Africa use some of the plant parts in traditional medicine (Bean and Johns, 2005; Wikipedia; https://plantinfo.co.za).