Well, not quite purple, but who would pay $8.00 to sit in a dark theater and watch "The Color Mauve"? I'm feeling downright professorial tonight, so I'll expound for a few paragraphs. I reshot this series today in front of my house. I actually have a better slide of it somewhere, using a lens that brought the background lantana a bit closer, but this will do.
As I gain a bit more knowledge about color and how we perceive it, I try to pass the info on to my adult education students so they have a broader knowledge of how to use color in their gardens. This is little series is a perfect example of how the same color can play completely different roles in a garden composition.
The iceplant in the foreground (Lampranthus spectabilis) has an eye-popping intensity, but the same color of lantana (Lantana montedvidensis) pales in comparison. As we look closer, we see that the surface of the iceplant is extremely glossy and reflects a lot of light.
If all the plants you use are of a similar value (regardless of the color), the scheme will be more harmonious. On the other hand, if you intentionally combine a flower of high value with others of lower value, you can achieve a very dramatic impact. There's no right or wrong way to combine colors. Just be aware of how all the variables come into play and use them as you will.