Cool Colors
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On the other side of the wheel are the cool colors -- greens, blues and purples.
Cool colors (violets, blues, and greens) appear to recede in the landscape.  They seem farther away than they really are, and can make small spaces feel bigger.
Cool colors have a calming, soothing effect.
If your flowers are mostly warm colors and you want to soften their intensity, consider adding some cool-color blooms and foliage to provide contrast. Here, the fiercely hot orange celosia is cooled by the purples of surrounding blooms.
If you garden in a small space, using cool colors will make it seem bigger.
Cool Colors