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Northern Toothache Tree

Zanthoxylum americanum

In the Carolinas and Georgia, found in woodlands, forests, and glade margins over calcareous or mafic rocks, often forming extensive colonies near outcrops. Sometimes planted. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

59
Strong

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

Profile 94%

Height
15–20 feet
Spread
10–15 feet
Light
Partial shade, Full sun
Soil moisture
Dry to moist

Space about 12.5 ft apart from its recorded spread. Enter your bed size for a count

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At a glance

Life cycle
Woody perennial
Leaves
Deciduous
Bloom
March to May
Fruiting season
July to August

Recorded in 11 Arkansas counties.

Natural habitats

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

1 of 4

Forests and woodlands

Forest or woodland where the source does not say how moist or dry.

Glades, barrens and outcrops on limestone

Open, thin-soil openings and rock on limestone, dolomite or other lime-rich rock, including cedar glades.

Glades, barrens and outcrops on mafic or serpentine rock

Open, thin-soil openings, outcrops and cliffs on dark, magnesium- or iron-rich rock such as serpentine, diabase or gabbro.

Cliffs, ledges and rocky summits

Cliffs, ledges, rock outcrops, talus and rocky summits where the source does not name the rock. A named rock files the place under its own glade or outcrop type instead.

All habitats

Also found with this plant

Wildlife whose habitat models include habitats this plant grows in, in Arkansas. Shared habitat, not food. 40 animals.

Widespread birds also seen here (48)

Found in many habitats here, so not listed above.

All wildlife of Arkansas

Ecological relationships

Who uses this plant?

What these records mean

7CaterpillarsGenus host records with ranges including AR

Genus host records with ranges including AR · Zanthoxylum

  • Dichomeris citrifoliellaOrange Webworm Moth
  • Hyphantria cuneaFall Webworm
  • Orgyia leucostigmaWhite-Marked Tussock Moth
  • Papilio cresphontesEastern Giant Swallowtail
  • Papilio glaucusEastern Tiger Swallowtail
  • Papilio troilusSpicebush Swallowtail
  • Agonopterix nigrinotella
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
5BeesSoutheastern regional records

Southeastern regional records · Zanthoxylum

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
0Specialist beesPollen specialists
3BirdsRecorded eating Zanthoxylum in Arkansas

Diet records by plant genus, from studies across North America. Not a record from this state. Birds whose range includes Arkansas, most records first.

Avian Diet Database (Hurlbert Lab)

Direct food only. 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

Birds that eat Zanthoxylum 3

Diet records by plant genus, from studies across North America. Not a record from this state. Avian Diet Database (Hurlbert Lab), CC0 1.0.

Growing and identification

Plant details

Family
Rutaceae
Hardiness
Zones 3–7
Soil pH
Neutral
Flower color
White or green
Fruit begins
July
Fruit ends
August

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

Growing sources and scope
Also known as

Northern Prickly Ash

Conservation status

Arkansas rankSNR
Global rankG5
AR statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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Sources