Common Boneset thrives in consistently moist soil, particularly during its active growth phase. Water deeply when the top inch of soil begins to dry out.

Avoid letting the plant sit in waterlogged conditions, which can lead to root rot. In hotter, drier periods, more frequent watering may be necessary.

To encourage bushier growth and prevent flopping, pinch back the growing tips of young plants in late spring or early summer.

Deadheading spent flowers can prevent self-seeding, though it is often left for winter interest and wildlife. Cut back stems to the ground in late fall or early spring.

Common Boneset is easily propagated from seed sown in fall or early spring. It also readily divides.

In spring or early fall, carefully dig up the plant and separate the root ball into sections, ensuring each division has at least one bud. Replant divisions immediately into prepared soil.

As Eupatorium perfoliatum is a perennial that typically grows in the ground, repotting is usually only relevant for container-grown specimens. If a container plant becomes root-bound, typically every 2-3 years, repot it into a slightly larger container with fresh, well-draining potting mix in the spring.