Aster novae-angliae 'Nachtauge' (New England Aster 'Nachtauge') is a tall, late-blooming perennial that brings strong color to the garden when many summer flowers are fading. You will get masses of daisy-like blooms in rich purple tones with contrasting centers, typically from late summer into fall, making it an excellent choice for extending seasonal interest.
Plant it in full sun for the strongest stems and heaviest flowering, but it will also perform in part shade. Give it average to moderately moist, well-drained soil, and water during extended dry spells, especially while establishing. Mature plants commonly reach 36-72 inches tall with a spread around 24-36 inches, so allow room for airflow and consider placing it where surrounding plants can help support its upright growth if needed.
Because it flowers in the fall, 'Nachtauge' is a valuable nectar source for pollinators and is a welcome addition to wildlife-friendly plantings. After flowering, let seed heads stand if you want added garden texture and to provide seasonal interest; many gardeners also appreciate the extra wildlife activity around the plants late in the year.
In USDA hardiness zones 4-8, cut stems back close to the ground after frost or in late winter before new growth begins. Divide clumps in spring if the plant becomes crowded, and pinch or shear lightly in early summer if you want a slightly shorter, bushier habit.