Does it need full sun?

It prefers full sun but will tolerate partial shade.

How often should I water it?

Keep the soil consistently moist as it naturally grows in wetlands.

Plant guide

Common boneset.

Eupatorium perfoliatum

Pronounced yoo-pah-TOR-ee-um per-fo-lee-AY-tum

Also known as Boneset, Chapman's Thoroughwort, Common Boneset, Thoroughwax, Thoroughwort, perfoliate thoroughwort

Eupatorium perfoliatum — Photo by Sue Wilder (CC0) via gbif

Common boneset is a sturdy native perennial that loves damp soil and attracts plenty of pollinators. It is famous for its historical use in folk medicine. You will love how its unique foliage looks in a rain garden or meadow planting.

At a glance

Care level: Easy
Plant type: Perennial herb
Light: Full sun to partial shade
Indoor light: Bright indirect
Water: Every 2 to 4 days
Mature size: 4 to 5 feet
Growth rate: Medium
Hardiness: USDA 3 to 9
Bloom time: Mid to late summer

Care

Keep the soil consistently moist because this plant naturally grows in wetlands. Watch for wilting leaves as a sign that it needs more water. It thrives best when given plenty of space to spread in a sunny spot.

Watering: Keep the soil damp at all times, as this plant does not tolerate drying out.
Feeding: Apply a balanced organic compost in early spring to support healthy growth.
Pruning: Cut the stems back to the ground in late winter or early spring.
Repotting: Divide the root clump every few years to keep the plant vigorous.
Soil: Moist, rich, well-draining soil
Soil pH: 6.0 to 7.5
Temperature: -30 to 35°C
Humidity: 50 to 90%
Drought tolerance: Low
Lifespan: Perennial, typically 5 to 10 years.
Fragrance: Light
Deer and rabbits: High

Signs it needs repotting

Roots growing out of the drainage holes
Stunted growth despite regular watering

Safety

People: The plant is considered toxic if ingested in large quantities due to the presence of alkaloids.
Pets: This plant is considered toxic to cats and dogs if ingested.
Children: Keep this plant away from small children as ingestion of any part can cause stomach upset.
Contact allergens: The foliage can cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen may trigger allergic reactions in those sensitive to Asteraceae family plants.
Edibility: This plant contains pyrrolizidine alkaloids and should not be ingested without expert guidance.

How to identify it

Opposite leaves joined at the base
Wrinkled and hairy leaf texture
Clusters of small white flowers
Stems covered in fine hairs

Height: 0.6 to 1.5m
Spread: 0.3 to 0.6m
Leaves: green, deciduous
Flowers: white, 0.5 to 1cm

Problems to watch for

Powdery mildew · A white fungal growth appears on leaves during periods of high humidity and poor airflow.

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed
When to plant: spring, fall
Overwintering: Cut the stems back to the ground in late winter or early spring before new growth appears.
In containers: It can grow in large containers if kept constantly moist, though it prefers the ground.

Division

1. Dig up the clump in early spring.
2. Use a sharp spade to divide the root mass.
3. Replant immediately in moist soil.

Group this plant with other moisture loving natives to create a self sustaining rain garden.

Grows well with

Joe Pye Weed · They share similar moisture requirements and bloom times.
Blue Vervain · This plant also thrives in the wet, sunny conditions favored by boneset.

Similar species

White Snakeroot · It has similar white flowers but prefers drier, shadier conditions.

Science

Family: Asteraceae
Genus: Eupatorium
Order: Asterales
Class: Magnoliopsida
Native range: Eastern and central North America.
Conservation: It is widespread and not currently of conservation concern.

It grows in wet meadows and along stream banks where it provides essential late season nectar for insects.

Value to wildlife: nectar source, larval host plant
Pollinators: bees, butterflies, moths
Uses: pollinator gardens, rain gardens, native plant meadows

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 6/9
Light: 7/9
Temperature: 5/9
Moisture: 8/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: It prefers full sun but will tolerate partial shade.
How often should I water it?: Keep the soil consistently moist as it naturally grows in wetlands.

Where the name comes from

The name Eupatorium honors Mithridates Eupator, a king of Pontus, while perfoliatum describes the leaves that surround the stem.

Good to know

The leaves appear to be pierced by the stem, which is why it is called perfoliatum.
It was a staple in colonial American medicine cabinets.
It thrives in damp, marshy soil conditions.

Also in

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.