North Carolina › Amaranthaceae › Alternanthera
Alligator-weed
Listed invasive in North Carolina (Rank 1, Severe Threat).
Insect resources, birds and habitat
Bars show recorded counts on a linear scale. Each category runs from zero to its largest count in this NC plant catalog; the same scale applies across plant pages. Compare plants within a category, not bar lengths across categories. Zero records may mean missing research. Growth form is shown as text.
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Overwintering: no reviewed hardiness guidance loaded. Heat tolerance is not assessed.
| NC status (state rank) | SE |
| Grows in | wet ground only (wetland occurrence proxy: OBL; not a measured watering requirement) |
| Soil pH range | 4.8–8.8 |
| Light | part shade to full sun (USDA PLANTS shade class 'Medium', read inverted (coarse)) |
| Recorded in NC | county records not available |
| Single-host caterpillars on genus | 1 |
- Vascular Plants of North Carolina, plant list export 2026-09-01 (LeGrand, Sorrie & Howard)
- NC Native Plant Society & NC Invasive Plant Council, NC Invasive Plants list, 2023-11-07
- U.S. Army Corps of Engineers, National Wetland Plant List 2022, Eastern Mountains & Piedmont
- USDA NRCS PLANTS Database
Machine-readable: alternanthera-philoxeroides.json. Cite as: Quercus Score v0.6.4, Alternanthera philoxeroides, North Carolina, 2026-09-24.
Quercus Score v0.6.4 · built 2026-09-24 · North Carolina beta · sources and limitations on every page