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Home / Browse / Eupatorium / Roundleaf Thoroughwort (var. cordigerum)
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Pictured: Eupatorium rotundifolium — the species. This variety isn’t separately illustrated.
Asteraceae family

Roundleaf Thoroughwort (var. cordigerum) Eupatorium rotundifolium var. cordigerum variety

Native

Roundleaf Thoroughwort (var. cordigerum) is a perennial wildflower native to the lower 48 states.

More about this plant

Eupatorium rotundifolium, commonly called roundleaf thoroughwort, is a North American species of plant in the family Asteraceae. It native to the eastern and central United States, in all the coastal states from Maine to Texas, and inland as far as Missouri and the Ohio Valley. It is found in low, moist habitats such as wet savannas and bogs. Wikipedia →

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 8 derived from its U.S. range
Size & form
Sources · Size & form
USDA PLANTS — Lifespan
Lifespan
Perennial
In the garden
Herb layer — Sits in the herb of a layered food forest or polyculture.Open guide →
derived roles
Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.

Wildlife & pollinators

How pollinator value is scored →
❧ Caterpillar hosts ~41 caterpillar species

Eupatorium supports ~41 caterpillar species.

Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is a strong genus.

Recorded feeding on Eupatorium in North America, including:

Agonopterix atrodorsella · concealer moth Agonopterix eupatoriiella · concealer moth Agonopterix pulvipennella · concealer moth Anavitrinella pampinaria · Common Gray Arctia caja · Garden Tiger Bucculatrix eupatoriella · ribbed cocoon-maker moth
+ 8 more species →
Calephelis perditalis · Rounded Metalmark Calephelis rawsoni · Rawson's Metalmark Carmenta bassiformis · Eupatorium Borer Moth Carmenta pyralidiformis · The Boneset Borer Carmenta texana · Texana Clearwing Moth Celastrina argiolus · Holly Blue Chlorochlamys chloroleucaria · geometer (inchworm) moth Chlosyne lacinia · Bordered Patch
Keystone count (genus-level) from Warren II 2026 (CC0) · Tallamy host-use records. Named species (a documented Nearctic sample, not exhaustive) from NHM HOSTS (CC0).
Species thumbnails re-hosted from iNaturalist — Creative Commons, credited per image (hover for credit). Click any species to see it on iNaturalist. Not exhaustive; many taxa have no openly-licensed photo yet.
Sources for this entry (11) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[05] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[06] Description — Wikipedia (CC BY-SA)
[07] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[08] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[09] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[10] Caterpillar species — NHM HOSTS (CC0)
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PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).

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