Introduced and assessed as invasive in the lower 48 states
Ohio law lists it as an invasive plant: not native to Ohio, and causing, or likely to cause, economic, environmental or human health harm.
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 0 of Ohio's 88 counties. Explore Ohio
No result yet (36)
Recorded, too few records for a result (41)
Recorded, season not shown (11)
Season shown (0)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Show as a table
Counties as a table
Asian bittersweet by Ohio county: records and mapped range
County
Records
Adams County
No qualifying records yet
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
126 · Recorded, season not shown
Auglaize County
No qualifying records yet
Belmont County
Recorded, too few records for a result
Brown County
No qualifying records yet
Butler County
32 · Recorded, season not shown
Carroll County
Recorded, too few records for a result
Champaign County
Recorded, too few records for a result
Clark County
Recorded, too few records for a result
Clermont County
40 · Recorded, season not shown
Clinton County
No qualifying records yet
Columbiana County
Recorded, too few records for a result
Coshocton County
Recorded, too few records for a result
Crawford County
No qualifying records yet
Cuyahoga County
25 · 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
23 · Recorded, season not shown
Fulton County
Recorded, too few records for a result
Gallia County
Recorded, too few records for a result
Geauga County
Recorded, too few records for a result
Greene County
Recorded, too few records for a result
Guernsey County
Recorded, too few records for a result
Hamilton County
79 · 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
No qualifying records yet
Hocking County
Recorded, too few records for a result
Holmes County
Recorded, too few records for a result
Huron County
No qualifying records yet
Jackson County
No qualifying records yet
Jefferson County
No qualifying records yet
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
No qualifying records yet
Lorain County
Recorded, too few records for a result
Lucas County
Recorded, too few records for a result
Madison County
Recorded, too few records for a result
Mahoning County
Recorded, too few records for a result
Marion County
No qualifying records yet
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
32 · Recorded, season not shown
Morgan County
No qualifying records yet
Morrow County
No qualifying records yet
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
Recorded, too few records for a result
Pickaway County
No qualifying records yet
Pike County
No qualifying records yet
Portage County
41 · Recorded, season not shown
Preble County
No qualifying records yet
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
No qualifying records yet
Scioto County
Recorded, too few records for a result
Seneca County
No qualifying records yet
Shelby County
No qualifying records yet
Stark County
33 · Recorded, season not shown
Summit County
101 · Recorded, season not shown
Trumbull County
No qualifying records yet
Tuscarawas County
Recorded, too few records for a result
Union County
No qualifying records yet
Van Wert County
No qualifying records yet
Vinton County
No qualifying records yet
Warren County
Recorded, too few records for a result
Washington County
No qualifying records yet
Wayne County
35 · Recorded, season not shown
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 Ohio
Early May to early January, middle week Sep 27 – Oct 3
Middle week · Sep 27 – Oct 3
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 1,063 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 709 dates. Latest record: December 2025.
Show as a table
Records of Asian bittersweet in Ohio each week, and records of all species
Week
Records of Asian bittersweet
Years recorded
Records of all species
Jan 4–10
2
2
6,211
Jan 11–17
6
4
5,146
Jan 18–24
7
2
4,645
Jan 25–31
14
3
4,698
Feb 1–7
3
2
6,023
Feb 8–14
1
1
5,888
Feb 15–21
6
3
5,436
Feb 22–28
4
4
6,846
Mar 1–7
2
2
8,321
Mar 8–14
4
2
10,384
Mar 15–21
5
2
12,620
Mar 22–28
7
4
13,949
Mar 29 – Apr 4
0
0
19,661
Apr 5–11
2
1
26,860
Apr 12–18
6
3
39,925
Apr 19–25
0
0
41,623
Apr 26 – May 2
20
6
56,391
May 3–9
16
6
52,952
May 10–16
13
6
53,785
May 17–23
19
6
57,698
May 24–30
24
7
54,651
May 31 – Jun 6
21
7
53,099
Jun 7–13
19
6
53,700
Jun 14–20
37
10
56,625
Jun 21–27
13
6
55,361
Jun 28 – Jul 4
26
8
58,477
Jul 5–11
13
7
61,336
Jul 12–18
29
7
64,722
Jul 19–25
18
7
69,753
Jul 26 – Aug 1
14
5
59,416
Aug 2–8
18
9
59,712
Aug 9–15
20
6
55,994
Aug 16–22
18
6
54,328
Aug 23–29
19
8
51,772
Aug 30 – Sep 5
17
7
57,167
Sep 6–12
17
6
59,075
Sep 13–19
46
7
54,543
Sep 20–26
38
9
45,860
Sep 27 – Oct 3
63
8
43,180
Oct 4–10
76
9
37,841
Oct 11–17
41
8
30,824
Oct 18–24
33
9
21,156
Oct 25–31
51
8
19,021
Nov 1–7
46
9
14,172
Nov 8–14
58
10
12,621
Nov 15–21
29
8
7,965
Nov 22–28
27
9
8,136
Nov 29 – Dec 5
25
9
6,083
Dec 6–12
23
8
6,004
Dec 13–19
12
6
5,423
Dec 20–26
15
9
5,661
Dec 27 – Jan 2
20
7
8,459
Reported in flower
Only 15 records here show flowers, too few to show a flowering season. One needs at least 20 records from 5 different years.
Reported in fruit
Usually reported in fruit late July to mid-January, middle week Oct 18–24.
From 342 records that show fruit. Not every photo of a plant in fruit is marked as fruiting, so this shows when people reported it in fruit, not when it fruits.
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.
American bittersweetCelastrus scandensOften confused in Ohio: 71 identifications in Ohio named one where the other was meant
Amur honeysuckleLonicera maackiiOften confused in Ohio: 14 identifications in Ohio named one where the other was meant
fortune's spindleEuonymus fortuneiOften confused in Ohio: 14 identifications in Ohio named one where the other was meant
bittersweet nightshadeSolanum dulcamaraOften confused in Ohio: 10 identifications in Ohio named one where the other was meant
winterberry hollyIlex verticillata126 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 cover
Its recordsAll Ohio records
Forest
51%31%
Developed
38%49%
Farmland
7%11%
Wetland
3%5%
Open water
1%3%
Grassland and shrub
0.6%0.9%
From 619 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.
