white snakeroot (Ageratina altissima)
(c) Douglas Goldman, some rights reserved (CC BY-SA), uploaded by Douglas Goldman · CC BY-SA 4.0 (opens in a new tab) · iNaturalist (opens in a new tab)
Flowering plantsIn Fairfield County, Ohio

White snakeroot

Ageratina altissima (L.) R.M.King & H.Rob.

White snakeroot in all of Ohio
Kingdom
Plantae
Phylum
Tracheophyta
Genus
Ageratina
Near Fairfield County

Range

Where it is recorded

Season shown in 8 of Ohio's 88 counties. Explore Ohio

  • No result yet (9)
  • Recorded, too few records for a result (46)
  • Recorded, season not shown (25)
  • Season shown (8)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Show as a table
Counties as a table
white snakeroot by Ohio county: records and mapped range
CountyRecords
Adams County25 · Recorded, season not shown
Allen CountyRecorded, too few records for a result
Ashland County37 · Recorded, season not shown
Ashtabula CountyRecorded, too few records for a result
Athens County282 · Recorded, season not shown
Auglaize CountyRecorded, too few records for a result
Belmont CountyRecorded, too few records for a result
Brown CountyRecorded, too few records for a result
Butler County394 · Recorded, season not shown
Carroll CountyRecorded, too few records for a result
Champaign County20 · Season shown
Clark County28 · Recorded, season not shown
Clermont County143 · Recorded, season not shown
Clinton CountyRecorded, too few records for a result
Columbiana CountyRecorded, too few records for a result
Coshocton CountyRecorded, too few records for a result
Crawford CountyRecorded, too few records for a result
Cuyahoga County281 · Recorded, season not shown
Darke CountyRecorded, too few records for a result
Defiance CountyNo qualifying records yet
Delaware County81 · Recorded, season not shown
Erie County32 · Recorded, season not shown
Fairfield County35 · Season shown
Fayette CountyNo qualifying records yet
Franklin County300 · Recorded, season not shown
Fulton CountyNo qualifying records yet
Gallia CountyRecorded, too few records for a result
Geauga County26 · Recorded, season not shown
Greene County134 · Season shown
Guernsey CountyRecorded, too few records for a result
Hamilton County558 · Season shown
Hancock CountyRecorded, too few records for a result
Hardin CountyNo qualifying records yet
Harrison CountyRecorded, too few records for a result
Henry CountyRecorded, too few records for a result
Highland CountyRecorded, too few records for a result
Hocking County24 · Recorded, season not shown
Holmes CountyRecorded, too few records for a result
Huron CountyRecorded, too few records for a result
Jackson CountyRecorded, too few records for a result
Jefferson CountyRecorded, too few records for a result
Knox County29 · Recorded, season not shown
Lake County37 · Season shown
Lawrence CountyRecorded, too few records for a result
Licking County94 · Recorded, season not shown
Logan CountyRecorded, too few records for a result
Lorain County43 · Recorded, season not shown
Lucas County36 · Recorded, season not shown
Madison CountyRecorded, too few records for a result
Mahoning CountyRecorded, too few records for a result
Marion CountyRecorded, too few records for a result
Medina County30 · Recorded, season not shown
Meigs CountyRecorded, too few records for a result
Mercer CountyNo qualifying records yet
Miami County21 · Recorded, season not shown
Monroe CountyRecorded, too few records for a result
Montgomery County111 · Recorded, season not shown
Morgan CountyRecorded, too few records for a result
Morrow CountyRecorded, too few records for a result
Muskingum CountyRecorded, too few records for a result
Noble CountyRecorded, too few records for a result
Ottawa CountyRecorded, too few records for a result
Paulding CountyNo qualifying records yet
Perry CountyRecorded, too few records for a result
Pickaway CountyRecorded, too few records for a result
Pike CountyRecorded, too few records for a result
Portage County27 · Season shown
Preble County34 · Recorded, season not shown
Putnam CountyNo qualifying records yet
Richland County43 · Season shown
Ross CountyRecorded, too few records for a result
Sandusky CountyRecorded, too few records for a result
Scioto CountyRecorded, too few records for a result
Seneca CountyRecorded, too few records for a result
Shelby CountyRecorded, too few records for a result
Stark County43 · Recorded, season not shown
Summit County166 · Recorded, season not shown
Trumbull CountyRecorded, too few records for a result
Tuscarawas CountyRecorded, too few records for a result
Union CountyRecorded, too few records for a result
Van Wert CountyNo qualifying records yet
Vinton CountyRecorded, too few records for a result
Warren County88 · Recorded, season not shown
Washington County21 · Recorded, season not shown
Wayne County45 · Recorded, season not shown
Williams CountyRecorded, too few records for a result
Wood County51 · Season shown
Wyandot CountyNo qualifying records yet

No mapped range from the range source used, the USGS Gap Analysis Project, which maps land vertebrates only.

Season

When it is recorded

In Fairfield County

Mid-August to early October, middle week Sep 20–26

Show over the bars
Recording in Fairfield County · records of all species each week, 10,892 in all

Records per week from 35 records in 9 of the 10 years from 2016 to 2025. Shows when people recorded it, not how common it is. The grey bars show how many records of all species were made here each week, so you can see when recording itself was high or low; the season is not adjusted by them.

Recorded on 28 dates. Latest record: October 2025.

Show as a table
Records of white snakeroot in Fairfield County each week, and records of all species
WeekRecords of white snakerootYears recordedRecords of all species
Jan 4–100030
Jan 11–170023
Jan 18–240019
Jan 25–310030
Feb 1–70019
Feb 8–140024
Feb 15–210027
Feb 22–280027
Mar 1–70049
Mar 8–140049
Mar 15–210045
Mar 22–280043
Mar 29 – Apr 40095
Apr 5–1100126
Apr 12–1800210
Apr 19–2500236
Apr 26 – May 200231
May 3–900289
May 10–1600275
May 17–2300190
May 24–3000289
May 31 – Jun 600461
Jun 7–1300274
Jun 14–2000366
Jun 21–2700324
Jun 28 – Jul 400334
Jul 5–1100307
Jul 12–1800468
Jul 19–2511682
Jul 26 – Aug 100334
Aug 2–800304
Aug 9–1511260
Aug 16–2200345
Aug 23–2943570
Aug 30 – Sep 511308
Sep 6–1242990
Sep 13–1933339
Sep 20–2684281
Sep 27 – Oct 344254
Oct 4–1085232
Oct 11–1700181
Oct 18–2400164
Oct 25–3111102
Nov 1–700318
Nov 8–140089
Nov 15–210045
Nov 22–280042
Nov 29 – Dec 50051
Dec 6–120043
Dec 13–190018
Dec 20–260032
Dec 27 – Jan 20048

Reported in flower

Only 3 records here show flowers, too few to show a flowering season. One needs at least 20 records from 5 different years.

Reported in fruit

No records here show fruit yet, so there is no fruiting season to show. One needs at least 20 records from 5 different years.

In Ohio

Mid-June to mid-October, middle week Sep 13–19

Show over the bars
Recording in Ohio · records of all species each week, 1,691,199 in all

Records per week from 4,469 records in 10 of the 10 years from 2016 to 2025. Shows when people recorded it, not how common it is. The grey bars show how many records of all species were made here each week, so you can see when recording itself was high or low; the season is not adjusted by them.

Recorded on 969 dates. Latest record: November 2025.

Show as a table
Records of white snakeroot in Ohio each week, and records of all species
WeekRecords of white snakerootYears recordedRecords of all species
Jan 4–10006,211
Jan 11–17005,146
Jan 18–24224,645
Jan 25–31004,698
Feb 1–7006,023
Feb 8–14005,888
Feb 15–21115,436
Feb 22–28006,846
Mar 1–7008,321
Mar 8–140010,384
Mar 15–210012,620
Mar 22–281113,949
Mar 29 – Apr 40019,661
Apr 5–111126,860
Apr 12–184339,925
Apr 19–257241,623
Apr 26 – May 231656,391
May 3–925652,952
May 10–1621353,785
May 17–2326757,698
May 24–3037754,651
May 31 – Jun 629853,099
Jun 7–1322753,700
Jun 14–2037656,625
Jun 21–2736655,361
Jun 28 – Jul 423758,477
Jul 5–1116661,336
Jul 12–1827664,722
Jul 19–2545769,753
Jul 26 – Aug 143859,416
Aug 2–876959,712
Aug 9–15871055,994
Aug 16–221131054,328
Aug 23–291621051,772
Aug 30 – Sep 53371057,167
Sep 6–125401059,075
Sep 13–196881054,543
Sep 20–266581045,860
Sep 27 – Oct 35321043,180
Oct 4–103161037,841
Oct 11–172011030,824
Oct 18–24125921,156
Oct 25–31120719,021
Nov 1–733714,172
Nov 8–1425712,621
Nov 15–211057,965
Nov 22–28648,136
Nov 29 – Dec 5336,083
Dec 6–12006,004
Dec 13–19115,423
Dec 20–26115,661
Dec 27 – Jan 2118,459

Reported in flower

Usually reported in flower early August to mid-October, middle week Sep 13–19.

From 335 records that show flowers. Not every photo of a plant in flower is marked as flowering, so this shows when people reported it in flower, not when it flowers.

Reported in fruit

No fruiting season shown here. Most records come from a single year, so a season is not shown yet.

What these results show

These results show when people recorded a species, not when or where it occurs. Missing weeks and low counts do not mean absence or scarcity, and counts are not abundance. Contributed records reflect where, when and what people chose to observe.

Identification

How to identify it

Telling it apart

From what Ohio’s records show. Only what the records support is shown.

Often confused with

  • late boneset Eupatorium serotinumOften confused in Ohio: 37 identifications in Ohio named one where the other was meant
  • common boneset Eupatorium perfoliatumOften confused in Ohio: 20 identifications in Ohio named one where the other was meant
  • false nettle Boehmeria cylindricaOften confused in Ohio: 16 identifications in Ohio named one where the other was meant
  • hairy crabweed Fatoua villosa91 identifications worldwide named one where the other was meant
  • White Wood Aster Eurybia divaricata46 identifications worldwide named one where the other was meant

From iNaturalist’s similar-species counts, refreshed monthly: confusions in Ohio first, then worldwide. Only species with an Ohio result are listed.

Land cover where it is recorded

Land coverIts recordsAll Ohio records
Forest48%31%
Developed44%49%
Farmland4%11%
Wetland3%5%
Open water0.6%3%
Grassland and shrub0.2%0.9%
Barren0.1%0.6%

From 3,015 records placed within 100 m, beside all Ohio records placed the same way. People record where they go, so this shows where records come from, not where the species lives. Land cover: USGS Annual NLCD, 2025 (opens in a new tab)

Sources

Where these results come from

  • Records from iNaturalist research-grade observations and expert-identified GBIF datasets, CC0, CC BY and CC BY-NC. Sources
  • Seasons use the published method and its evidence thresholds. Methods
  • See it on iNaturalist (opens in a new tab)OpenPhenology is independent and not affiliated with iNaturalist.

Records behind the Fairfield County result

35 records from 2 datasets.

To cite: the GBIF download doi:10.15468/dl.y2jkt8 (opens in a new tab).

A spreadsheet (CSV) with a link to each record, on iNaturalist or GBIF. Records whose location was hidden by the observer or the source are counted but not linked.