While red, yellow and orange are warm colors, blue and purple are "cool" colors....
Purple is an example of a cool color.
As such, they're perfect for meditation gardens, for instance. After gazing into the rich color of this purple iris for a while, who wouldn't begin to relax a bit? Flowers this dark are also sometimes classified as "black flowers
." Consult my detailed resource on bearded iris flowers
to learn more about this type of plant.