Index / Search / Asclepias incarnata

§1 Plant

Asclepias incarnata L.

vernacular swamp milkweed — species · Asclepiadaceae


USDA
ASIN
GBIF
3170266
Rank
species
swamp milkweed (Asclepias incarnata)
Platephotograph · aarongunnarCC BY source · iNaturalist ↗

§2Habit & range

Habit and range

Growth habit
Forb/herb
Duration
Perennial
Group
Dicot
Family
Asclepiadaceae Borkh.
Genus
Asclepias
§2a

Native status, by region

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

County-level range

· 436 counties across 17 states/territories
Legend Native · 436 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

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

Climate & soil

Cold tolerance
-38 °F minimum
Frost-free days
107 min.
Precipitation
15–65 in/yr
pH range
5–8
Root depth
18 in min.
Fertility need
Medium
Soil texture
medium, fine
§3c

Form & growth

Growth form
Rhizomatous
Growth rate
Moderate
Lifespan
Moderate
Mature height
4.9 ft
Foliage texture
Coarse
Foliage colour
Green
Porosity (summer)
Moderate
Porosity (winter)
Porous
Flower colour
Red
Fruit colour
Brown
Fire resistant
Yes
N fixation
None
Toxicity
Moderate
§3d

Reproduction

Bloom period
Fall
Seed abundance
Medium
Seed begins
Spring
Seed ends
Fall
Spread rate
Slow
Stratify
No
Seeds / lb
153,761
Propagation
seed, sprigs
§3e

Use & availability

Commercial availability
Routinely Available
Nursery stock
No
Graze palatability
Low
Palatable, human
No
Protein potential
Low
Lumber
No
Christmas tree
No

§4Counties, by state

Recorded in 436 counties across 17 states/territories.

Alabama view state ↗ 2 N
Arkansas view state ↗ 5 N
Delaware view state ↗ 3 N
District of Columbia view state ↗ 1 N
Florida view state ↗ 21 N
Georgia view state ↗ 9 N
Kentucky view state ↗ 72 N
Maine view state ↗ 14 N
Massachusetts view state ↗ 14 N
New Hampshire view state ↗ 10 N
New Jersey view state ↗ 21 N
New York view state ↗ 47 N
Pennsylvania view state ↗ 62 N
Rhode Island view state ↗ 5 N
Vermont view state ↗ 13 N
Virginia view state ↗ 96 N
West Virginia view state ↗ 41 N

§5Sources & provenance

USDA PLANTS

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

plants.usda.gov/ASIN ↗

GBIF Backbone

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

gbif.org/species/3170266 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-26

fetched 2026-05-26T05:06:36Z