This trio of perennials, selected primarily for foliage, is best suited for a part shade situation; morning sun and afternoon shade would be ideal.
Brunnera ‘Jack Frost’ and Carex glauca ‘Blue Zinger’ with their cool blue and silver tones, are a neutral and flexible base, yet are visually engaging because of their contrast in texture. The third plant in the pictured planting combination is a Heuchera, the exact variety uncertain, but the one pictured is likely Heuchera ‘Root Beer' though 'Mahogany' or 'Peach Flambe' would be good substitutes.
Blue and silver, typically indicate a tip towards a cooler color scheme. The addition of the coral foliage color represents a fork in the road; an opening to warm it up. As a result, the trio pictured above reads warmer due to the introduction of the rich earthy tones of the Heuchera ‘Root Beer'.
If one had instead used a heuchera with deep pink foliage, such as the Heuchera 'Georgia Plum' pictured here, the tone of this vignette would shift significantly. Further, there would be an impact on what would be a good choice for the next possible plant partner in this evolving vignette.
Creating great planting combinations is a process of constantly narrowing; a process of "if this, then that." Each choice representing a fork in the road. In this example, the selected heuchera is the pivotal plant. There are so many heuchera to choose from and there are several that would work great in combination with this brunnera and carex. Just keep in mind that with each plant that you add to your garden vignettes, your choices are direction-setting for further additions.