Cape Town has mediteranean climate. Hot dry summers (38 deg C) and cold wet winters (5 deg C).
Cape Town is also known for its "
fynbos" vegetation. These plants specialise in surviving the dry summers due to its structure.
The Orchids on the other hand can not survive these harsh conditions, so they bloom in spring and die back after wards. These orchids has tubers below the ground to help survive the summers. They should survive similiar condtions as the D cisitflora. It is important to have the right climate conditions, moist well draining sandy soil and correct light cues. Most important is water quality. They get water from mountain streams, in other words, clean.
Interesting though, the Disa seeds can be sown ontop of a sand and peat mixture and can be germinated like Drosera Capensis seeds without special agar mediums.