If you want dramatic foliage that still looks refined in bloom, Eupatorium rugosum 'Chocolate' (White Snakeroot 'Chocolate') is an easy way to add depth to the back of a border or to a naturalized planting. Deep, chocolate-toned leaves and dark stems create a strong backdrop for the airy, flat-topped clusters of small white flowers that open in late summer into fall.
Give your plant full sun to part shade. In hotter climates, a little afternoon shade helps keep growth lush. Aim for consistently moist soil that drains well; this plant is not a drought lover, and it looks best when it does not dry out for long stretches. Mulch to hold moisture and moderate soil temperatures, especially during the first season while roots establish.
Mature plants form upright clumps about 36-60 inches tall, with a spread commonly around 24-36 inches. Space plants so air can move through the stems and so the foliage can color up fully. The white flowers are a useful late-season nectar source and are often visited by pollinators. Leave spent seed heads for winter interest, or cut stems back after flowering if you prefer a tidier look and want to limit self-seeding.
Maintenance is simple: water during dry spells, top-dress with compost in spring if desired, and divide every few years if clumps become crowded. All parts of this plant are considered toxic if ingested, so place it thoughtfully where children and pets are unlikely to sample foliage.