This is a grass built for the edge of things. Panicum amarum is native to sandy dunes and coastal shores, spreading by rhizomes through inhospitable ground where most ornamental plants would fail within a season. The blue-green foliage grows in clumps reaching 3 to 4 feet, and by fall the airy pink flower panicles emerge and persist well into winter, catching low light in a way that justifies its place in any border that needs late-season movement.

In the garden proper it performs best in well-drained, dry to medium-moisture soils — lean conditions that keep it upright. Adding too much organic matter or fertilizer encourages flopping, the one habit that needs managing. Cut it back hard in late winter before new growth breaks, and it returns reliably through zones 2 to 9. Effective as a dune stabilizer, a rain garden plant, or a bold textural note in a naturalistic border, it is among the most low-maintenance grasses available to the North American gardener.