Plant Common Boneset in early spring or fall. Choose a location with full sun to partial shade and moist, well-drained soil. Space plants about 2-3 feet apart. Water regularly to keep the soil consistently moist, especially during dry spells. Fertilize lightly in spring with a balanced fertilizer. Deadhead spent flowers to encourage more blooms. Cut back stems in late fall or early spring to promote healthy growth. Divide clumps every 3-4 years to maintain vigor.