Introduced and assessed as invasive in the lower 48 states
iNaturalist's volunteer curators list it as introduced in their Ohio checklist.
US-RIIS assesses a species as invasive when it causes, or is likely to cause, harm there, or is at least locally abundant and harmful ecologically, economically, or to health.
Season shown in 1 of Ohio's 88 counties. Explore Ohio
No result yet (27)
Recorded, too few records for a result (55)
Recorded, season not shown (5)
Season shown (1)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Show as a table
Counties as a table
hairy bittercress by Ohio county: records and mapped range
County
Records
Adams County
Recorded, too few records for a result
Allen County
Recorded, too few records for a result
Ashland County
Recorded, too few records for a result
Ashtabula County
Recorded, too few records for a result
Athens County
73 · Recorded, season not shown
Auglaize County
No qualifying records yet
Belmont County
No qualifying records yet
Brown County
Recorded, too few records for a result
Butler County
Recorded, too few records for a result
Carroll County
Recorded, too few records for a result
Champaign County
No qualifying records yet
Clark County
Recorded, too few records for a result
Clermont County
Recorded, too few records for a result
Clinton County
Recorded, too few records for a result
Columbiana County
Recorded, too few records for a result
Coshocton County
Recorded, too few records for a result
Crawford County
Recorded, too few records for a result
Cuyahoga County
51 · Recorded, season not shown
Darke County
No qualifying records yet
Defiance County
No qualifying records yet
Delaware County
Recorded, too few records for a result
Erie County
Recorded, too few records for a result
Fairfield County
Recorded, too few records for a result
Fayette County
No qualifying records yet
Franklin County
31 · Season shown
Fulton County
No qualifying records yet
Gallia County
Recorded, too few records for a result
Geauga County
Recorded, too few records for a result
Greene County
21 · Recorded, season not shown
Guernsey County
No qualifying records yet
Hamilton County
46 · Recorded, season not shown
Hancock County
Recorded, too few records for a result
Hardin County
No qualifying records yet
Harrison County
Recorded, too few records for a result
Henry County
Recorded, too few records for a result
Highland County
Recorded, too few records for a result
Hocking County
Recorded, too few records for a result
Holmes County
No qualifying records yet
Huron County
No qualifying records yet
Jackson County
Recorded, too few records for a result
Jefferson County
Recorded, too few records for a result
Knox County
Recorded, too few records for a result
Lake County
Recorded, too few records for a result
Lawrence County
No qualifying records yet
Licking County
Recorded, too few records for a result
Logan County
Recorded, too few records for a result
Lorain County
Recorded, too few records for a result
Lucas County
Recorded, too few records for a result
Madison County
No qualifying records yet
Mahoning County
Recorded, too few records for a result
Marion County
Recorded, too few records for a result
Medina County
Recorded, too few records for a result
Meigs County
Recorded, too few records for a result
Mercer County
No qualifying records yet
Miami County
Recorded, too few records for a result
Monroe County
Recorded, too few records for a result
Montgomery County
Recorded, too few records for a result
Morgan County
No qualifying records yet
Morrow County
Recorded, too few records for a result
Muskingum County
Recorded, too few records for a result
Noble County
No qualifying records yet
Ottawa County
No qualifying records yet
Paulding County
No qualifying records yet
Perry County
No qualifying records yet
Pickaway County
No qualifying records yet
Pike County
No qualifying records yet
Portage County
Recorded, too few records for a result
Preble County
Recorded, too few records for a result
Putnam County
No qualifying records yet
Richland County
Recorded, too few records for a result
Ross County
Recorded, too few records for a result
Sandusky County
Recorded, too few records for a result
Scioto County
Recorded, too few records for a result
Seneca County
No qualifying records yet
Shelby County
No qualifying records yet
Stark County
Recorded, too few records for a result
Summit County
44 · Recorded, season not shown
Trumbull County
Recorded, too few records for a result
Tuscarawas County
Recorded, too few records for a result
Union County
Recorded, too few records for a result
Van Wert County
No qualifying records yet
Vinton County
Recorded, too few records for a result
Warren County
Recorded, too few records for a result
Washington County
Recorded, too few records for a result
Wayne County
Recorded, too few records for a result
Williams County
No qualifying records yet
Wood County
Recorded, too few records for a result
Wyandot County
No 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 Athens County
Not enough evidence
Most records come from a single year, so a season is not shown yet. Based on 73 records in 7 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Athens County · records of all species each week, 51,499 in all
Records per week from 73 records in 7 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
Records of hairy bittercress in Athens County each week, and records of all species
Week
Records of hairy bittercress
Years recorded
Records of all species
Jan 4–10
0
0
74
Jan 11–17
0
0
132
Jan 18–24
0
0
107
Jan 25–31
0
0
219
Feb 1–7
0
0
392
Feb 8–14
1
1
232
Feb 15–21
0
0
235
Feb 22–28
0
0
361
Mar 1–7
1
1
532
Mar 8–14
4
4
466
Mar 15–21
13
3
593
Mar 22–28
16
4
950
Mar 29 – Apr 4
10
5
1,265
Apr 5–11
9
3
1,616
Apr 12–18
3
2
1,804
Apr 19–25
2
1
1,926
Apr 26 – May 2
11
3
2,291
May 3–9
0
0
1,407
May 10–16
0
0
1,408
May 17–23
0
0
2,542
May 24–30
1
1
1,821
May 31 – Jun 6
0
0
798
Jun 7–13
0
0
775
Jun 14–20
0
0
830
Jun 21–27
0
0
700
Jun 28 – Jul 4
0
0
549
Jul 5–11
0
0
664
Jul 12–18
0
0
869
Jul 19–25
0
0
700
Jul 26 – Aug 1
0
0
673
Aug 2–8
0
0
613
Aug 9–15
0
0
871
Aug 16–22
0
0
807
Aug 23–29
0
0
1,289
Aug 30 – Sep 5
0
0
2,925
Sep 6–12
0
0
2,530
Sep 13–19
0
0
2,417
Sep 20–26
0
0
1,530
Sep 27 – Oct 3
0
0
1,628
Oct 4–10
0
0
1,836
Oct 11–17
0
0
1,920
Oct 18–24
0
0
825
Oct 25–31
0
0
930
Nov 1–7
0
0
881
Nov 8–14
0
0
846
Nov 15–21
0
0
573
Nov 22–28
0
0
536
Nov 29 – Dec 5
0
0
270
Dec 6–12
0
0
982
Dec 13–19
0
0
158
Dec 20–26
2
2
106
Dec 27 – Jan 2
0
0
95
Reported in flower
No records here show flowers yet, so there is no flowering season to show. One needs at least 20 records from 5 different years.
Reported in fruit
Only 1 records here show fruit, too few to show a fruiting season. One needs at least 20 records from 5 different years.
In Ohio
Not enough evidence
The weeks are still too uncertain to show a season. Based on 658 records in 10 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
This week · Nov 8–14
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Ohio · records of all species each week, 1,691,199 in all
Records per week from 658 records in 10 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
Records of hairy bittercress in Ohio each week, and records of all species
Week
Records of hairy bittercress
Years recorded
Records of all species
Jan 4–10
4
2
6,211
Jan 11–17
4
2
5,146
Jan 18–24
1
1
4,645
Jan 25–31
1
1
4,698
Feb 1–7
4
3
6,023
Feb 8–14
4
2
5,888
Feb 15–21
6
2
5,436
Feb 22–28
9
4
6,846
Mar 1–7
22
7
8,321
Mar 8–14
32
8
10,384
Mar 15–21
82
8
12,620
Mar 22–28
88
9
13,949
Mar 29 – Apr 4
96
9
19,661
Apr 5–11
104
10
26,860
Apr 12–18
65
9
39,925
Apr 19–25
30
9
41,623
Apr 26 – May 2
60
9
56,391
May 3–9
11
8
52,952
May 10–16
6
2
53,785
May 17–23
2
2
57,698
May 24–30
3
2
54,651
May 31 – Jun 6
2
2
53,099
Jun 7–13
1
1
53,700
Jun 14–20
0
0
56,625
Jun 21–27
0
0
55,361
Jun 28 – Jul 4
0
0
58,477
Jul 5–11
0
0
61,336
Jul 12–18
0
0
64,722
Jul 19–25
0
0
69,753
Jul 26 – Aug 1
0
0
59,416
Aug 2–8
0
0
59,712
Aug 9–15
0
0
55,994
Aug 16–22
0
0
54,328
Aug 23–29
0
0
51,772
Aug 30 – Sep 5
0
0
57,167
Sep 6–12
0
0
59,075
Sep 13–19
0
0
54,543
Sep 20–26
1
1
45,860
Sep 27 – Oct 3
0
0
43,180
Oct 4–10
0
0
37,841
Oct 11–17
1
1
30,824
Oct 18–24
1
1
21,156
Oct 25–31
0
0
19,021
Nov 1–7
4
3
14,172
Nov 8–14
0
0
12,621
Nov 15–21
1
1
7,965
Nov 22–28
1
1
8,136
Nov 29 – Dec 5
2
2
6,083
Dec 6–12
0
0
6,004
Dec 13–19
3
1
5,423
Dec 20–26
3
3
5,661
Dec 27 – Jan 2
4
4
8,459
Reported in flower
Usually reported in flower early March to late April, middle week Mar 29 – Apr 4.
From 66 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
Only 13 records here show fruit, too few to show a fruiting season. One needs at least 20 records from 5 different years.
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.
Common WhitlowgrassDraba vernaOften confused in Ohio: 48 identifications in Ohio named one where the other was meant
shepherd's-purseCapsella bursa-pastoris75 identifications worldwide named one where the other was meant
watercressNasturtium officinale48 identifications worldwide named one where the other was meant
narrow-leaved bittercressCardamine impatiens46 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.
Months not reported
Jan: recorded
Feb: recorded
Mar: recorded
Apr: recorded
May: recorded
Jun: recorded
Jul: no record
Aug: no record
Sep: recorded
Oct: recorded
Nov: recorded
Dec: recorded
Not reported in Ohio in July to August, 2016 to 2025.
Land cover where it is recorded
Land cover
Its recordsAll Ohio records
Developed
72%49%
Forest
19%31%
Farmland
6%11%
Wetland
3%5%
From 406 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
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.
