Based on the information that has been posted concerning this topic,
it looks like there is no such thing as a "nation wide" Landscaping Iris.
However, it appears that one or more type of Iris could be used for such in
a given area.
Siberians can be used as Landscaping Irises in certain climates. In
other areas, Iris pseudacorus probably is better for this. Some places,
the reblooming TB POLAR KING could fit this calling. It looks like the
proper Iris to be used will always depend on the climate and the situation
at the site in question.
In this part of Florida, the African Iris is very frequently used in
large-scale landscaping. It thrives under these conditions.
Mark A. Cook Low: 35 F ( 2 C)
firstname.lastname@example.org High: 75 F (24 C)
Dunnellon, FL. Now: 55 F (12 C) Mostly sunny today.