Threadleaf Arrowhead
Sagittaria filiformis
Found in swiftly flowing water of blackwater rivers and streams, blackwater lake shores, tidal waters. Weakley, Flora of the Southeastern United States (2025), Northern Tier edition What its natural habitat tells you
Native to Virginia. How scores work Is it native here?
Profile 94%
- Height
- Up to about 5 feet
- Light
- Partial shade, Full sun
- Soil moisture
- Wet to standing water

At a glance
- Life cycle
- Perennial
- Bloom
- May to September
Not yet recorded · Spread · Leaves
Recorded in 1 Virginia county.
Natural habitats
Places it grows wild. Not a planting requirement. Each habitat page lists the plants and wildlife also found there.
Streams, rivers and their banks


Also found with this plant
Wildlife whose habitat models include habitats this plant grows in, in Virginia. Shared habitat, not food. 169 animals.
- Acadian FlycatcherEmpidonax virescens
- American CootFulica americana
- American KestrelFalco sparverius
- American RedstartSetophaga ruticilla
- American Tree SparrowSpizella arborea
- American WoodcockScolopax minor
- Barred OwlStrix varia
- Black-and-White WarblerMniotilta varia
- Black-throated Green WarblerDendroica virens
- Blue GrosbeakPasserina caerulea
- Blue JayCyanocitta cristata
- Blue-gray GnatcatcherPolioptila caerulea
- Broad-winged HawkButeo platypterus
- Brown CreeperCerthia americana
- Brown ThrasherToxostoma rufum
- Brown-headed CowbirdMolothrus ater
- Canada GooseBranta canadensis
- Carolina ChickadeePoecile carolinensis
- Cedar WaxwingBombycilla cedrorum
- Cerulean WarblerDendroica cerulea
- Common GrackleQuiscalus quiscula
- Double-crested CormorantPhalacrocorax auritus
- Downy WoodpeckerPicoides pubescens
- Eastern Screech-owlMegascops asio
Who uses this plant?
7CaterpillarsGenus host records with ranges including VA
Genus host records with ranges including VA · Sagittaria
- Acronicta oblinitaSmeared Dagger
- Argyrogramma verrucaGolden Looper
- Bellura obliquaCattail Border Moth, Cattail Diver
- Elophila icciusalisPondside Pyralid, Pondside Crambid
- Elophila obliteralisWaterlily Leafcutter Moth
- Parapoynx obscuralisObscure Pondweed Moth
- Bellura anoa
11BeesSoutheastern regional records
Southeastern regional records · Sagittaria
Individual names are not available yet.
Noori, Seltmann & Orr 2026, A curated and integrated dataset for exploring global bee-plant interactions (GloBI), Zenodo, CC BY 4.0
11BirdsRecorded genus food-resource interactions; not a state feeding claim
Recorded genus food-resource interactions; not a state feeding claim · Sagittaria
- Aix sponsaWood Duck
- Anas platyrhynchosMallard
- Anser caerulescensSnow Goose
- Antigone canadensisSandhill Crane
- Aythya affinisLesser Scaup
- Aythya collarisRing-necked Duck
- Aythya valisineriaCanvasback
- Bucephala clangulaCommon Goldeneye
- Fulica americanaAmerican Coot
- Gallinula galeataCommon Gallinule
Show all 11
- Mareca americanaAmerican Wigeon
Direct food only: birds recorded eating this genus across North America. Caterpillars on host plants also feed nesting birds. NC Native Plant Society: butterfly gardening
No records yet · Ants · Beetles · Flies · Adult butterflies / moths · Other wasps · Other insects
Plant details
- Family
- Alismataceae
- Flower color
- White
Safety has not been reviewed for this plant; check toxicity and thorns before planting.
Growing sources and scope
- Bloom · “May to September” · Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition · Carolinas and Georgia
- Flower color · “White” · Lady Bird Johnson Wildflower Center
- Height · “Up to about 5 feet” · Lady Bird Johnson Wildflower Center
- Life cycle · “Perennial” · Lady Bird Johnson Wildflower Center
- Light · “Partial shade; Full sun (documented habitat)” · Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition · Carolinas and Georgia
- primary_flower_color · “white” · Lady Bird Johnson Wildflower Center
- Soil · “Water; Wet (documented habitat)” · Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition · Carolinas and Georgia
Also known as
Sagittaria subulata var. gracillima
Conservation status
| Virginia rank | SH |
|---|---|
| Global rank | G4 |
| VA status | Not verified |
| Federal status | Not verified |
Will it fit your yard?
Check this plant against your county, sun and soil moisture. Conditions are checked in your browser.
Sources
- Virginia DCR Natural Heritage rare plant list
- Digital Atlas of the Virginia Flora
- USDA PLANTS
- Vascular Plants of North Carolina (NC Natural Heritage Program)
- Weakley, Flora of the Southeastern United States (2025)
- NatureServe Explorer
- Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
- Noori, Seltmann & Orr 2026, A curated and integrated dataset for exploring global bee-plant interactions (GloBI), Zenodo, CC BY 4.0
- Smith, Bachelder, Russell, Morales, Mosher & Seltmann 2024, Bee-Specialization-Modeling v0.6.1 (specialist host table compiled from J. Fowler's pollen specialist bee lists), Zenodo, CC BY 4.0
- Hurlbert, Olsen, Sawyer & Winner 2021, Avian Diet Database, Scientific Data 8: 260 (CC0)
- Narango, Tallamy & Shropshire 2020, Few keystone plant genera support the majority of Lepidoptera species, Nature Communications

























