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Boneset

Eupatorium perfoliatum · Asteraceae

The gardener's calendar

The right move for September

Ideal time to plant boneset: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Deciduous
Flowering
August to October
Adult size
60 to 150 cm in height
Growth
Fast
Hardiness
Down to -20 °C
Origin
North America
Soil type
Moist, well-drained, tolerant

Care

Watering

Perfoliate Joe-Pye weed appreciates moist soils and prefers locations near wetland areas or ponds. Water regularly during dry periods, especially in the first year after planting. Once established, the plant tolerates moisture well and is not afraid of temporary excess water.

Light exposure

Place perfoliate Joe-Pye weed in full sun or partial shade for optimal flowering. It tolerates partial shade well, but produces more flowers in sunlight. Avoid areas too exposed to wind that could damage its stems.

Soil and preparation

This plant adapts to many soil types but prefers slightly acidic to neutral soil, rich in organic matter and well-drained. Amend the soil with compost at planting to promote moisture retention. It also tolerates poor soils, making it very hardy.

Pruning and training

Cut the stems back to 15-20 cm from the ground in late winter or early spring, before new growth begins. You can also cut back lightly in early summer to encourage denser branching. Remove spent flowers to prolong flowering if desired.

Fertilizing

Perfoliate Joe-Pye weed is not very demanding in nutrients. An application of well-decomposed compost in spring is usually sufficient. Avoid fertilizers too rich in nitrogen, which would promote foliage at the expense of flowering.

Diseases and pests

This plant is generally very robust and rarely affected by serious diseases. Watch for powdery mildew in case of rot or excessive stagnant moisture. Pests are rare; good air circulation prevents most problems.

Did you know?

Perfoliate Joe-Pye weed owes its scientific name to King Mithridates VI of Pontus, passionate about medicinal botany, who reportedly discovered its properties. Its characteristic leaves, which appear to be pierced by the stem (hence 'perfoliate'), make it an easily recognizable plant. Traditionally used by Native American peoples, it remains a star of butterfly and pollinator gardens in autumn.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.