You can use Heuchera 'Black Sea' to add dramatic, near-black foliage that holds its color through the season and makes lighter companions pop. It forms a textured mound of ruffled leaves, then sends up airy stems of creamy-white blooms in summer for a soft contrast against the dark foliage.
Plant it in full sun to part shade; in hotter areas, give it afternoon shade for the best leaf color and easiest care. Provide organically rich, well-drained soil and steady moisture as it establishes. Once rooted in, it handles average garden moisture well, but it looks best when the soil does not swing from soggy to bone dry.
At maturity it reaches about 14-24 inches tall with a tidy, mounding habit, making it an easy fit for borders, mixed beds, and containers. Tuck it at the front of a perennial border, weave it between flowering plants for contrast, or repeat it in drifts for a sleek, modern look.
Clean up old leaves as needed and cut back spent flower stems for a neat finish. In cold-winter climates, a light mulch after the ground freezes can help reduce heaving and protect the crown.