PlantKey Open ecological atlas
Planner
Home / Browse / Conyza / Asthmaweed
Wikimedia Commons — CC, credited & licensed per image
Asteraceae family

Asthmaweed Conyza floribunda

Late-season nectar — Flowers in a late-autumn window when few other plants in our catalog bloom — valuable late forage for pollinators (relative to our catalog's bloom coverage).

Asthmaweed is an introduced annual herb, found in Hawaii, the lower 48 states, and Puerto Rico. It blooms Aug – Nov.

More about this plant

Erigeron sumatrensis is an annual herb probably native to South America, but widely naturalised in tropical and subtropical regions, and regarded as an invasive weed in many places.It is a perennial in the Western Cape of South Africa. Wikipedia →

⚠ Invasive here — plant a native instead USDA + GBIF

Asthmaweed is flagged invasive in the U.S. These natives fill a similar niche — same growth habit, bloom season, height, and region — so you keep the look and feed local wildlife instead of spreading a problem.

Sweet Acacia
Native
Sweet Acacia
Vachellia farnesiana
●●●●○
Spiny Amaranth
Native
Spiny Amaranth
Amaranthus spinosus
●●○○○
Cutleaf Groundcherry
Native
Cutleaf Groundcherry
Physalis angulata
●●○○○
Washerwoman
Native
Washerwoman
Alternanthera caracasana
●○○○○
Matched on growth habit · bloom months · mature height · shared U.S. range (USDA + GBIF) — a starting point, not a prescription.

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 9 derived from its U.S. range
Size & form
Sources · Size & form
USDA PLANTS — Lifespan
Lifespan
Annual
In the garden
Herb layer — Sits in the herb of a layered food forest or polyculture.Open guide →
derived roles
The garden year bloom → fruit → fall colour
J
F
M
A
M
J
J
A
S
O
N
D
Bloom
Bloom (the flower's colour)
Bloom · Aug – Nov — 31 obs · Herbarium specimens — Park et al. 2023 (CC BY 4.0)
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 ~11 caterpillar species

Conyza supports ~11 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 moderate genus.

Recorded feeding on Conyza in North America, including:

Charidryas nycteis · brush-footed butterfly Chlorochlamys chloroleucaria · geometer (inchworm) moth Ctenoplusia oxygramma · Sharp-Stigma Looper Moth Cucullia florea · Gray Hooded-Owlet Cucullia speyeri · owlet moth Eupithecia miserulata · Common Eupithecia
+ 5 more species →
Peridroma saucia · Pearly Underwing Sparganothis sulfureana · Sparganothis Fruitworm Spodoptera ornithogalli · Yellow-Striped Armyworm Moth Synchlora aerata · Wavy-Lined Emerald Thyridopteryx ephemeraeformis · Evergreen Bagworm Moth
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 (12) 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 — US-RIIS v2.0 (USGS)
[07] Description — Wikipedia (CC BY-SA)
[08] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[10] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[11] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[12] Caterpillar species — NHM HOSTS (CC0)
Spot an error or have a better photo? Every field links to its source, and the whole dataset is open.
Cite this page Open data, please attribute

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).

Citation

Loading…

BibTeX 
Loading…