Are Dietes native to Australia?
Dietes bicolor (African iris) is native to, well, South Africa, and therefore to neither North America nor Australia.
What is the difference between dietes grandiflora and Dietes Iridioides?
iridioides both have white flowers marked with yellow and violet, and appear similar in photographs, but they are quite different: those of grandiflora are much larger, last three days, and have dark spots at the base of the outer tepals, while those of iridioides are small, last only one day, and lack the spots.
Should you cut back African iris?
Pruning away the damaged foliage in spring will revive the plant’s good looks. Simply snip off the dead leaves at the base using sharp, pointed pruning shears or scissors. Be careful not to snip any foliage surrounding the damaged leaves because it can create bare patches in the plant that cannot be corrected.