States
North CarolinaTennesseeGeorgiaSouth CarolinaKentuckyAlabamaArkansasFloridaLouisianaMississippiVirginiaWest Virginia
Menu

Hemlock Water-parsnip

Sium suave

In the Carolinas and Georgia, found in freshwater marshes, brackish marshes, swamp forests, in tidally or seasonally flooded hydrology. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

19
Modest

Native to Louisiana. How scores work Is it native here?

Profile 88%

Height
3–6 feet
Spread
2–3 feet
Light
Full sun
Soil moisture
Moist to wet

Space about 2.5 ft apart from its recorded spread, about 16 per 100 sq ft. Enter your bed size for a count

Will it fit your yard?

Rare or protected plant. Specialist conservation planting; excluded from routine garden suggestions. Plant caution source

Hidden from default planting suggestions. Wildlife value and native status remain unchanged.

At a glance

Life cycle
Perennial
Bloom
June to August
Fruiting season
August to October

Not yet recorded · Leaves

Recorded in 4 Louisiana parishes.

Natural habitats

Places it grows wild. Not a planting requirement. Each habitat page lists the plants and wildlife also found there.

1 of 3

Freshwater marshes

Open, herb-covered wetlands with fresh, non-tidal water.

Salt and brackish marshes

Coastal marshes flooded by salty or brackish tides.

Swamps

Forested wetlands with standing water much of the year, such as cypress and gum swamps.

All habitats

Ecological relationships

Who uses this plant?

What these records mean

2CaterpillarsGenus host records with ranges including LA

Genus host records with ranges including LA · Sium

  • Papilio polyxenesBlack Swallowtail, Celery Caterpillar, Fennel Worm, Desert Black Swallowtail, Parsnip Swallowtail
  • Thyraylia bunteana
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
0BeesSoutheastern regional records
0Specialist beesPollen specialists
—BirdsRecorded genus food-resource interactions; not a state feeding claim

No records yet · Ants · Beetles · Flies · Adult butterflies / moths · Other wasps · Other insects

Growing and identification

Plant details

Family
Apiaceae
Hardiness
Zones 3–9
Flower color
White
Fruit begins
August
Fruit ends
October
Growing sources and scope
Also known as

Hemlock Water parsnip; Water Parsnip

Conservation status

Louisiana rankS1S2
Global rankG5
LA statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

Will it fit your yard?

Check this plant against your county, sun and soil moisture. Conditions are checked in your browser.

Choose a county to begin.

How to check your spot

Sources