Index / Search / Lycopus americanus

§1 Plant

Lycopus americanus Muhl. ex W.P.C. Barton

vernacular American water horehound — species · Lamiaceae


USDA
LYAM
GBIF
5341461
Rank
species
American water horehound (Lycopus americanus)
Platephotograph · Dan MullenCC BY-NC-ND source · iNaturalist ↗

§2Habit & range

Habit and range

Growth habit
Forb/herb
Duration
Perennial
Group
Dicot
Family
Lamiaceae Martinov
Genus
Lycopus
§2a

Native status, by region

  • CAN Canada Native
  • L48 Lower 48 States Native
§2b

County-level range

· 1,236 counties across 38 states/territories
Legend Native · 1236 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

Drought
Low
Shade
Low
Moisture use
High
Fire
High
Salinity
Low
Anaerobic
High
CaCO₃
Medium
Hedging
None
§3b

Climate & soil

Cold tolerance
-38 °F minimum
Frost-free days
120 min.
Precipitation
12–60 in/yr
pH range
5.2–7.8
Root depth
10 in min.
Fertility need
Medium
Soil texture
medium, fine
§3c

Form & growth

Growth form
Single Crown
Growth rate
Moderate
Lifespan
Long
Mature height
1.8 ft
Foliage texture
Coarse
Foliage colour
Green
Porosity (summer)
Moderate
Porosity (winter)
Porous
Flower colour
White
Fruit colour
Brown
Fire resistant
No
N fixation
None
Toxicity
None
§3d

Reproduction

Bloom period
Early Summer
Seed abundance
Medium
Seed begins
Summer
Seed ends
Fall
Spread rate
Moderate
Stratify
No
Seeds / lb
3,025,308
Propagation
seed, tubers
§3e

Use & availability

Commercial availability
Routinely Available
Nursery stock
No
Palatable, human
No
Lumber
No
Christmas tree
No

§4Counties, by state

Recorded in 1,236 counties across 38 states/territories.

Alabama view state ↗ 5 N
Arizona view state ↗ 2 N
Arkansas view state ↗ 9 N
Delaware view state ↗ 2 N
District of Columbia view state ↗ 1 N
Florida view state ↗ 1 N
Illinois view state ↗ 102 N
Indiana view state ↗ 75 N
Iowa view state ↗ 20 N
Kansas view state ↗ 80 N
Kentucky view state ↗ 50 N
Louisiana view state ↗ 13 N
Maine view state ↗ 16 N
Maryland view state ↗ 1 N
Massachusetts view state ↗ 14 N
Michigan view state ↗ 77 N
Minnesota view state ↗ 74 N
Mississippi view state ↗ 5 N
Missouri view state ↗ 88 N
Montana view state ↗ 7 N
Nebraska view state ↗ 55 N
New Hampshire view state ↗ 10 N
New Jersey view state ↗ 18 N
New Mexico view state ↗ 8 N
New York view state ↗ 47 N
North Carolina view state ↗ 10 N
North Dakota view state ↗ 41 N
Ohio view state ↗ 85 N
Oklahoma view state ↗ 24 N
Pennsylvania view state ↗ 67 N
Rhode Island view state ↗ 4 N
South Carolina view state ↗ 1 N
South Dakota view state ↗ 22 N
Tennessee view state ↗ 30 N
Vermont view state ↗ 13 N
Virginia view state ↗ 69 N
West Virginia view state ↗ 26 N
Wisconsin view state ↗ 64 N

§5Sources & provenance

USDA PLANTS

Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.

plants.usda.gov/LYAM ↗

GBIF Backbone

Canonical taxonomic identity, synonym resolution, cross-refs. CC0.

gbif.org/species/5341461 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-26

fetched 2026-05-26T09:28:40Z