Haworthia koelmaniorum is known from the area around Groblersdal in Mpumalanga, and has also been collected elswhere.
The plants are related to Haworthia limifolia but have a darker and brownish colour and also lack the stoloniferous nature sometimes found in the latter species.
Although Haworthia koelmaniorum naturally occurs in the summer rainfall area, the plants seem to have no problem when cultivated under similar conditions as their winter-growing relatives.
Propagation is from seed or leaf cuttings. Growth is slow.
The first two pictures are from Haworthia koelmaniorum in cultivation.
The following two pictures are hybrids with Haworthia koelmaniorum as one parent. The plants were created by Gerhard Marx.
Haworthia minima x koelmaniorum
Haworthia koelmaniorum x mortonii