One of the most useful colors in any garden is silver. Aside from white, no other color produces such a strikingly pale neutral that coordinates with virtually everything. Silver defines boundaries and balances color. It helps anchor a garden through strong contrast and visual buoyancy. It can even sit quietly in the background and let everything else shine.
Excluding metal objects, when we say “silver” in gardening terms we mean living foliage with a silvery bloom or cast. The color isn’t metallic, obviously. “Silver” foliage is closer to gray, powder blue, sea-glass green or pistachio, often with white fuzz. A few flowers can also pass as silver. All are valuable to the gardener for their high-contrast properties. In both very low and very strong light, these cultivars often reflect a silvery or pale countenance, hence the term “silver”.