Primarily a primary palette !
This comes to life in Light Box!
I love to use bright primary colors in this sunny section of my back yard border. When the Salvia 'Victoria Blue' and the blue iris (or later the blue agapanthus) are not in bloom, I have an analogous red, orange and yellow scheme that also pleases my eye.
The edges of this section are like shape shifters, with shade quickly replaced by blazing sun and back again so it is a bit difficult to find things that will remain happy in both environments. Each season the light and shade patterns change as the trees grow or die back, both my own and neighboring trees.