States
North CarolinaTennesseeGeorgiaSouth CarolinaKentuckyAlabamaArkansasFloridaLouisianaMississippiVirginiaWest Virginia
Menu

Roadside Pennycress

Thlaspi alliaceum

In the Carolinas and Georgia, found in fields, disturbed areas, roadsides. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

—
Not native

Not native to Louisiana. How scores work Is it native here?

Profile 53%

Light
Full sun
Soil moisture
Dry to moist

At a glance

Bloom
March to April
Fruiting season
April to May

Not yet recorded · Height · Spread · Life cycle · Leaves

This plant is missing most of its facts, so Quercus is looking them up in old botany books.

County records are not available.

Natural habitats

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

Roadsides, fields and disturbed ground

Ground opened by people: roadsides, old fields, pastures, fencerows and lots.

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 · Thlaspi

  • Eustixia pupulaSpotted Peppergrass Moth
  • Pontia protodiceCheckered White
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
—BeesSoutheastern regional records
—Specialist beesPollen specialists
2BirdsRecorded genus food-resource interactions; not a state feeding claim

Recorded genus food-resource interactions; not a state feeding claim · Thlaspi

  • Centrocercus urophasianusGreater Sage-Grouse
  • Pooecetes gramineusVesper Sparrow
Hurlbert, Olsen, Sawyer & Winner 2021, Avian Diet Database, Scientific Data 8: 260 (CC0)

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

Growing and identification

Plant details

Family
Brassicaceae
Fruit begins
April
Fruit ends
May

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

Growing sources and scope
Also known as

Garlic Pennycress; Thlaspi alliaceum; pennycress

Conservation status

Louisiana rankSNA
Global rankGNR
LA statusNot verified
Federal statusNot verified

Conservation source Global and federal source

Native alternatives

Find natives for your garden

Sources