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This species has been shown to be the cause of the \"milk sickness\" of pioneer days; the plants contain a poison which is transmissible to humans through cow milk."},{"field":"heliophily_index","source_column":"HIndex","source_database_sha256":"684f6b364ff9f3023aa61ed02ae50f6f6d6d4d3bcf76847b78ab769ae0453469","source_record_id":5731,"source_table":"Organism","value":3},{"field":"regional_wetland_indicators","source_column":"WetlandStatus1..5","source_database_sha256":"684f6b364ff9f3023aa61ed02ae50f6f6d6d4d3bcf76847b78ab769ae0453469","source_record_id":5731,"source_table":"Organism","value":[{"source_column":"WetlandStatus1","value":"FACU"},{"source_column":"WetlandStatus2","value":"FACU"},{"source_column":"WetlandStatus3","value":"FACU"},{"source_column":"WetlandStatus4","value":"FACU"},{"source_column":"WetlandStatus5","value":"UPL"}]},{"field":"habitat_moisture_categories","source_column":"Attr2","source_database_sha256":"684f6b364ff9f3023aa61ed02ae50f6f6d6d4d3bcf76847b78ab769ae0453469","source_record_id":5731,"source_table":"GraphicKey","value":["Dry","Moist"]},{"field":"habitat_light_categories","source_column":"Attr3","source_database_sha256":"684f6b364ff9f3023aa61ed02ae50f6f6d6d4d3bcf76847b78ab769ae0453469","source_record_id":5731,"source_table":"GraphicKey","value":["Partial shade","Full shade"]},{"field":"graphic_key_source_attributes","source_column":"Attr0..25","source_database_sha256":"684f6b364ff9f3023aa61ed02ae50f6f6d6d4d3bcf76847b78ab769ae0453469","source_record_id":5731,"source_table":"GraphicKey","value":{"Attr0":"gr08","Attr1":"nc_cp,nc_mt,nc_pd,sc_cp,sc_mt,sc_pd,ga_cp,ga_mt,ga_pd,","Attr10":"to","Attr11":"dk","Attr13":"wh","Attr14":"bris","Attr2":"Dry,Moist","Attr3":"Part,Shade","Attr3a":"y","Attr3a_subregion":"native_nc_cp:y,native_nc_mt:y,native_nc_pd:y,native_sc_cp:y,native_sc_mt:y,native_sc_pd:y,native_ga_cp:y,native_ga_mt:y,native_ga_pd:y,","Attr4":" 7-12","Attr5":"gl,pu","Attr6":"n","Attr7":"n","Attr8":"opp","Attr9":"si"}},{"field":"bloom_season","source_column":"Phenology","source_database_sha256":"684f6b364ff9f3023aa61ed02ae50f6f6d6d4d3bcf76847b78ab769ae0453469","source_record_id":5731,"source_table":"Organism","value":"Late July to November"}],"values":{"bloom_season":"Late July to November","botanical_comments":"Var. angustata (A. Gray) Clewell & Wooten is sometimes recognized, and ranges from IL and e. KS south to LA and c. TX. This species has been shown to be the cause of the \"milk sickness\" of pioneer days; the plants contain a poison which is transmissible to humans through cow milk.","geographic_range_description":"Québec west to se. North Dakota, south to Panhandle Florida and c. Texas.","graphic_key_source_attributes":{"Attr0":"gr08","Attr1":"nc_cp,nc_mt,nc_pd,sc_cp,sc_mt,sc_pd,ga_cp,ga_mt,ga_pd,","Attr10":"to","Attr11":"dk","Attr13":"wh","Attr14":"bris","Attr2":"Dry,Moist","Attr3":"Part,Shade","Attr3a":"y","Attr3a_subregion":"native_nc_cp:y,native_nc_mt:y,native_nc_pd:y,native_sc_cp:y,native_sc_mt:y,native_sc_pd:y,native_ga_cp:y,native_ga_mt:y,native_ga_pd:y,","Attr4":" 7-12","Attr5":"gl,pu","Attr6":"n","Attr7":"n","Attr8":"opp","Attr9":"si"},"habitat_description":"Moist forests, such as cove forests. 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R.M.King & H.Rob. var. angustata (A.Gray) Blake — NS, Clewell & Wooten (1971); Eupatorium rugosum Houtt. — G, GrPl, NcTx, Oh3, RAB, Tat, Tx, W; > Eupatorium rugosum Houtt. var. chlorolepis Fernald — F; > Eupatorium rugosum Houtt. var. rugosum — F; > Eupatorium rugosum Houtt. var. tomentellum (B.L.Rob.) Blake — F]"}},"mobot_plantfinder":{"matched_name":"Ageratina altissima","retrieved":"2026-10-03T21:49:25.385047+00:00","scope":{"kind":"unspecified"},"scope_note":"Source-reported species characteristics; not a location-specific estimate.","source_label":"Missouri Botanical Garden Plant Finder","source_sha256":"2b54ddd98086cea86b5b637e10577d498ace99119d2d2a7649122de4b44ab1ff","source_url":"https://plantfinder.mobot.org/PlantFinderDetails.aspx?taxonid=277391&isprofile=0&n=1","trait_evidence":[{"expected_source_name":"Ageratina altissima","field":"hardiness_zones","original_field":"hardiness","record_id":"trait:3f46e8f0a63a56a034c21df5ada25f24783c32ab87ead9d0d1157bbc06ebdd6a","retrieved_at":"2026-10-03T21:49:25.385047+00:00","scope":{"kind":"unspecified"},"scope_note":"Species profile; distribution and native-status discovery filters do not establish local growing or bloom timing.","source":"mobot","source_name":"Ageratina altissima","source_sha256":"2b54ddd98086cea86b5b637e10577d498ace99119d2d2a7649122de4b44ab1ff","source_url":"https://plantfinder.mobot.org/PlantFinderDetails.aspx?taxonid=277391&isprofile=0&n=1","status":"eligible_fact","taxon_id":"taxon:8e8a44ff-e741-51ae-b3e5-744e56a50803","value":["3 to 8"]},{"expected_source_name":"Ageratina altissima","field":"light","original_field":"light","record_id":"trait:4b5fade558ed92ed54bb5e104d9db3bb5d243ce216d33e07408551196e2fad37","retrieved_at":"2026-10-03T21:49:25.385047+00:00","scope":{"kind":"unspecified"},"scope_note":"Species profile; distribution and native-status discovery filters do not establish local growing or bloom timing.","source":"mobot","source_name":"Ageratina altissima","source_sha256":"2b54ddd98086cea86b5b637e10577d498ace99119d2d2a7649122de4b44ab1ff","source_url":"https://plantfinder.mobot.org/PlantFinderDetails.aspx?taxonid=277391&isprofile=0&n=1","status":"eligible_fact","taxon_id":"taxon:8e8a44ff-e741-51ae-b3e5-744e56a50803","value":["Full sun to part shade"]},{"expected_source_name":"Ageratina altissima","field":"spread_description","original_field":"spread","record_id":"trait:6a5d9491f1d795f010c34ce50064bbb73719e72c62126872425c02c82f068d12","retrieved_at":"2026-10-03T21:49:25.385047+00:00","scope":{"kind":"unspecified"},"scope_note":"Species profile; distribution and native-status discovery filters do not establish local growing or bloom timing.","source":"mobot","source_name":"Ageratina altissima","source_sha256":"2b54ddd98086cea86b5b637e10577d498ace99119d2d2a7649122de4b44ab1ff","source_url":"https://plantfinder.mobot.org/PlantFinderDetails.aspx?taxonid=277391&isprofile=0&n=1","status":"eligible_fact","taxon_id":"taxon:8e8a44ff-e741-51ae-b3e5-744e56a50803","value":{"max":4,"min":2,"unit":"feet"}},{"expected_source_name":"Ageratina altissima","field":"moisture_categories","original_field":"soil_moisture","record_id":"trait:775a9724b5e6b8c5dfa13c7ca29f26f9caeb30b6179de9f0d980eddc4e0c6fc6","retrieved_at":"2026-10-03T21:49:25.385047+00:00","scope":{"kind":"unspecified"},"scope_note":"Species profile; distribution and native-status discovery filters do not establish local growing or bloom timing.","source":"mobot","source_name":"Ageratina altissima","source_sha256":"2b54ddd98086cea86b5b637e10577d498ace99119d2d2a7649122de4b44ab1ff","source_url":"https://plantfinder.mobot.org/PlantFinderDetails.aspx?taxonid=277391&isprofile=0&n=1","status":"eligible_fact","taxon_id":"taxon:8e8a44ff-e741-51ae-b3e5-744e56a50803","value":["Medium to wet"]},{"expected_source_name":"Ageratina altissima","field":"height_description","original_field":"height","record_id":"trait:b913d3846e4dfa8e65e7743d6183a3912ff30092b6c5937cb857b54b4d74967b","retrieved_at":"2026-10-03T21:49:25.385047+00:00","scope":{"kind":"unspecified"},"scope_note":"Species profile; distribution and native-status discovery filters do not establish local growing or bloom timing.","source":"mobot","source_name":"Ageratina altissima","source_sha256":"2b54ddd98086cea86b5b637e10577d498ace99119d2d2a7649122de4b44ab1ff","source_url":"https://plantfinder.mobot.org/PlantFinderDetails.aspx?taxonid=277391&isprofile=0&n=1","status":"eligible_fact","taxon_id":"taxon:8e8a44ff-e741-51ae-b3e5-744e56a50803","value":{"max":5,"min":3,"unit":"feet"}}],"values":{"hardiness_zones":["3 to 8"],"height_description":"3–5 feet","light":["Full sun to part shade"],"moisture_categories":["Medium to wet"],"spread_description":"2–4 feet"}},"prairie_moon_2026":{"identity_basis":"Exact scientific name; no new synonym guesses","matched_name":"Ageratina altissima","page":3,"retrieved":"2026-09-30T18:00:34.396046+00:00","row_top":184.447,"scope":"Nursery cultural guide; height in flower; moisture categories retained as printed","source_label":"Prairie Moon 2026 Cultural Guide","source_sha256":"a0653d627b36184cd6bdd39aaea55efe2c15be3899976de28f978edc07a23cf1","source_url":"https://www.prairiemoon.com/catalogs/Prairie-Moon-Nursery-Cultural-Guide-2026.pdf","values":{"bloom_season":["July","August","September","October"],"flower_color":["White"],"height_description":"2 feet (in flower)","light":["Part shade (3–6 hours)","Shade (under 3 hours)"],"moisture_categories":["Wet-mesic","Mesic","Dry-mesic"]}},"ut_smart_yards":{"identity_basis":"Exact scientific name; no new synonym guesses","matched_name":"Ageratina altissima","modified":"2022-07-30T01:07:18+00:00","page_id":"740","scope":"Published Tennessee growing guidance; exact cached scientific heading","source_label":"Tennessee Smart Yards","source_url":"https://tynnativeplants.wordpress.com/flowers/common-name/white-snakeroot/","values":{"height_description":"2-5 ft","light":["Part sun"],"moisture_categories":["medium"]}},"virginia_coastal":{"identity_basis":"Exact scientific name; 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not a location-specific estimate.","source_label":"Lady Bird Johnson Wildflower Center","source_sha256":"d2e163dd101c541c44c20a9a66c3b41f819e7412ab57ba4abcf4f7ee27d89eb3","source_url":"https://www.wildflower.org/plants/result.php?id_plant=AGAL5","trait_evidence":[{"expected_source_name":"Ageratina altissima","field":"life_cycle","original_field":"life_cycle","record_id":"trait:1567a758ca780e50fbf4f1d4523b6c8f76991e60e5f40e26f966ed2abd0f8fa1","retrieved_at":"2026-10-03T21:55:39.938148+00:00","scope":{"kind":"unspecified"},"scope_note":"Species profile; distribution and native-status discovery filters do not establish local growing or bloom timing.","source":"wildflower","source_name":"Ageratina altissima","source_sha256":"d2e163dd101c541c44c20a9a66c3b41f819e7412ab57ba4abcf4f7ee27d89eb3","source_url":"https://www.wildflower.org/plants/result.php?id_plant=AGAL5","status":"eligible_fact","taxon_id":"taxon:8e8a44ff-e741-51ae-b3e5-744e56a50803","value":["Perennial"]},{"expected_source_name":"Ageratina altissima","field":"light","original_field":"light","record_id":"trait:8c4a5711bf76364b792a12d74d69388b1cb22f3d0f96e75261dd0bc4411c8bed","retrieved_at":"2026-10-03T21:55:39.938148+00:00","scope":{"kind":"unspecified"},"scope_note":"Species profile; 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Speaks for its own area (NC), not this state: Vascular Plants of North Carolina (NC Natural Heritage Program).","label":"Native to Virginia (state-specific source)","provenance":{"flags":["over_higher_tier"],"source":"va_atlas","specificity":"state","tier":"published_flora"},"rule":"fact-hierarchy-2","status":"native_supported"},"source_name":"Ageratina altissima","taxon_id":"taxon:8e8a44ff-e741-51ae-b3e5-744e56a50803","revision":"publish:cdb975f5-333c-4482-92bd-514ef43ee9c3","photos":[{"id":"ageratina-altissima-1063409","src":"/api/photos/image/4686c95a830561ade38ef42bbb35c2fb9398e2df20479f365ed0ff9eab182b06.jpg","view":"bloom","alt":"Ageratina altissima — bloom photograph","width":960,"height":610,"artist":"Sten Porse","license":"CC BY-SA 3.0","license_url":"http://creativecommons.org/licenses/by-sa/3.0/","source_url":"https://commons.wikimedia.org/wiki/File:Eupatorium-rugosum-flowers.JPG","changes":"Wikimedia thumbnail; no crop or retouching","kind":"photo"}]}