Flower profile
Billygoat weed
Ageratum conyzoides
Billygoat weed is a wildflower that USDA PLANTS lists as introduced in the lower 48 states. In Hawaii it's most often seen in bloom in January–December.
*iNaturalist research-grade observations, as of October 17, 2026.
On our lists for: Hawaii
Quick look
Ageratum conyzoides is native to Tropical America, especially Brazil, and is an invasive weed in many other regions. It is an herb that is 0.5–1 m. high, with ovate leaves 2–6 cm long, and flowers are white to mauve.
- It belongs to the Asteraceae family. iNaturalist
- USDA PLANTS describes it as an herb (forb) with a annual, perennial life cycle. USDA PLANTS
- USDA PLANTS lists it as introduced in the lower 48 states and records it in 12 states. USDA PLANTS
- NatureServe lists it as not native to Hawaii. NatureServe
- In Hawaii, most iNaturalist sightings of it in flower come in January–December. iNaturalist
- iNaturalist has 789 research-grade sightings of it in Hawaii, ranking #57 among the 105 flowers on our Hawaii list. iNaturalist
Billygoat weed gift ideas
Handmade billygoat weed gifts from independent makers.
🌱 Sample spot. Handmade gift picks from independent shops will appear here once our shop partnership is approved. These cards are placeholders, not real products.
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Billygoat weed art print
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Billygoat weed greeting card
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Billygoat weed mug
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Billygoat weed earrings
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Billygoat weed embroidery pattern
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Billygoat weed sticker
When does it bloom?
In Hawaii, most flowering sightings come in January–December.
Conservation status
- Federal (U.S. ESA)
- Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. USFWS ECOS
- NatureServe global
- G5 Secure worldwide. NatureServe
- Hawaii
- Not listed Not on Hawaii threatened and endangered plants (HAR 13-107; the state list follows the federal list), DLNR Division of Forestry and Wildlife. NatureServe: SNA, not applicable (usually because it isn't native there) in Hawaii. HAR 13-107
- Rare elsewhere
- No other U.S. state ranks it S1, S2, SH or SX.
Checked October 17, 2026. Rankings and lists can change, so follow the links for the latest.
Can you eat it?
None of the sources we checked (NC State Extension (no page for this plant), USDA PLANTS) say whether it's edible or poisonous for people.
It isn't on the ASPCA plant list.
🌿 Never eat a wild plant unless you're certain of its ID; this isn't medical advice. Worried about a person? Call Poison Control at 1-800-222-1222. Worried about a pet? Call your vet.
Where does it grow?
USDA PLANTS records billygoat weed in 12 states.
recorded by USDA PLANTS on our state lists not recorded
See the full list of states
Alabama, California, Connecticut, Florida, Georgia, Hawaii, Kentucky, Louisiana, Maryland, Mississippi, Missouri, North Carolina.
Hawaii counties with USDA records: Hawaii, Honolulu, Kauai, Maui.
More Hawaii flowers
Sources
- USDA, NRCS. PLANTS Database, profile AGCO.
- iNaturalist, Ageratum conyzoides: taxonomy, research-grade observation counts and “Flowering” annotations, retrieved October 17, 2026.
- Wikipedia, Ageratum conyzoides (lead quoted under CC BY-SA 4.0).
- Hawaii: Hawaii threatened and endangered plants (HAR 13-107; the state list follows the federal list), DLNR Division of Forestry and Wildlife.
- Hawaii: Hawaii noxious weed list (HAR 4-68).
- USFWS, ECOS species database (ESA listing check), October 17, 2026.
- NatureServe Explorer, Ageratum conyzoides (global and state ranks).
- Edibility and toxicity: no source found (marked "not well documented").
- Photo: Tyler Bishop via iNaturalist · CC BY 4.0 · resized.