Harvest Bells blooms when the garden is winding down, which makes it all the more arresting. A native perennial of North Carolina's moist woodlands, bogs, and stream banks, Gentiana saponaria opens its deep blue-to-purple flowers in September, clustered at the tops of upright, unbranched stems. The flowers hold partially closed, giving them a characteristically swollen appearance that is distinctive in the genus. In milder climates the bloom can stretch well into November, and the foliage shifts to reddish-yellow before frost, providing a quiet farewell.

This gentian is not a plant to tuck into dry, sunny beds. It wants moisture and reasonable organic content in the soil, and it performs best in partial shade, though it will accept more sun if the ground stays reliably damp. Sandy soils are fine as long as they do not dry out entirely. Use it at the edge of a woodland planting, beside a rain garden, or naturalized along a shaded path where it can develop undisturbed. Bees make good use of the late-season flowers, which is reason enough to find it a home.