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Hemlock Water-parsnip

Sium suave

Found in freshwater marshes, brackish marshes, swamp forests, in tidally or seasonally flooded hydrology. Weakley, Flora of the Southeastern United States (2025), Florida edition What its natural habitat tells you

21
Good

Native to Florida. 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?

At a glance

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

Not yet recorded · Leaves

Recorded in 11 Florida counties.

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

Georgia pond and emergent wetland
Regional / representative. Shown: Chattahoochee River National Recreation Area, Georgia; representative pond ecosystem, a neighboring state.Georgia pond and emergent wetland, Robert 'Bob' Hynes, 1997. Public domain. Source record.

Swamps

Loblolly bay in a coastal swamp
Regional / representative. Shown: Southern coastal swamps, Florida to Virginia; state not identified, a neighboring state.Loblolly bay in a coastal swamp, Marian Ellis Rowan, 1901. Public domain. Source record.

Salt and brackish marshes

Coastal marshes flooded by salty or brackish tides.

All habitats

Also found with this plant

Wildlife whose habitat models include habitats this plant grows in, in Florida. Shared habitat, not food. 110 animals.

All wildlife of Florida

Ecological relationships

Who uses this plant?

What these records mean

3CaterpillarsGenus host records with ranges including FL

Genus host records with ranges including FL · Sium

  • Papilio polyxenesBlack Swallowtail, Celery Caterpillar, Fennel Worm, Desert Black Swallowtail, Parsnip Swallowtail
  • Depressaria cinereocostella
  • 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

Safety has not been reviewed for this plant; check toxicity and thorns before planting.

Growing sources and scope
Also known as

Hemlock Water parsnip; Water Parsnip

Conservation status

Florida rankSNR
Global rankG5
FL statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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How to check your spot

Sources