Late boneset
Eupatorium serotinum · Asteraceae
The gardener's calendar
Ideal time to plant late boneset: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Scientific name
- Eupatorium serotinum
- Family
- Asteraceae
- Type
- Perennial herbaceous plant
- Foliage
- Deciduous
- Flowering
- August to October
- Mature size
- 0.90 to 1.50 m in height
- Hardiness
- Down to -15 °C
- Origin
- United States (east and central)
Care
Sunlight
Late boneset thrives in full sun or partial shade. It requires at least 5 to 6 hours of direct sunlight for generous flowering. A location with light afternoon shade works well in hot regions.
Watering
Water regularly during establishment (first year). Once established, this plant tolerates dry periods well thanks to its deep root system. Keep the soil slightly moist during active growth, especially during prolonged drought.
Soil and Planting
Late boneset prefers well-draining soils rich in organic matter and slightly moist. It adapts to various soil types but dislikes waterlogging in winter. Enrich the soil at planting with well-decomposed compost.
Pruning and Maintenance
Cut the plant back to ground level in late autumn or early spring, after the last frosts. Remove spent flowers to encourage prolonged blooming. No formal pruning is necessary during the growing season.
Fertilizing
An annual application of compost in spring is usually sufficient. Avoid nitrogen-rich fertilizers that promote foliage at the expense of flowering. Moderate fertilization once or twice during the growing season is optional but beneficial.
Diseases and Pests
Late boneset is robust and rarely subject to serious diseases. Excess moisture can promote root rot or leaf spots. Ensure good air circulation through the foliage and avoid overhead watering to prevent fungal problems.
Did you know?
The genus Eupatorium is named after Mithridates VI Eupator, king of Pontus, who reportedly used a species of boneset as a universal antidote (theriaca). Late boneset, though less famous than its European cousins, has become a prized ornamental plant in North American wildflower gardens for its wispy white-pink flowers that attract butterflies and bees late in the season.
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.
Add this plant to my garden →Plants from the same family
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- Canadian goldenrodSolidago canadensis
- WormwoodArtemisia absinthium
Tips generated and checked by Viridia — adapt them to your local climate.