Also known as Augusto · Fall Boneset · G
Lateflowering Thoroughwort (Eupatorium serotinum) is a tall, clump-forming perennial with flat-topped clusters of small, white flowers that bloom late in the season.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun to Part Shade
75% intensity
Prefers full sun for best flowering but will tolerate partial shade. In hotter climates, some afternoon shade can be beneficial.
Consistent
50% intensity
Keep soil consistently moist but not waterlogged, especially in dry weather. Established plants are somewhat drought-tolerant.
Loam, Sand, Clay, Acid, Neutral, Alkaline
50% intensity
Hardy
25% intensity
Tolerates a wide range of temperatures, suitable for USDA hardiness zones 3-8. Frost hardy.
Light
25% intensity
Heavy fertilization is not required; a light application of balanced fertilizer in spring is sufficient.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
| Edible | No |
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Water consistently, especially during dry periods, to maintain evenly moist soil. Avoid waterlogged conditions, as this can lead to root rot.
Once established, Lateflowering Thoroughwort can tolerate occasional dryness but performs best with regular watering.
To encourage bushier growth and prevent legginess, pinch back the stems in late spring or early summer. Deadhead spent flowers to prevent self-seeding if desired, though this is often unnecessary as it is not overly aggressive.
Eupatorium serotinum can be easily propagated by seed sown in autumn or early spring. Division of established clumps in early spring is also an effective method to increase plant numbers.
Repotting is typically only necessary for container-grown plants or when dividing mature specimens. This is best done in early spring before new growth begins. Ensure the new container has adequate drainage.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Lateflowering Thoroughwort (Eupatorium serotinum)
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Eupatorium |
| Species | Eupatorium serotinum |
Similar in genus Eupatorium
Answers based on plant encyclopedia data
