Herbaceous, perennial vine that twines 3-6’ tall with small hairs on the stems and seed pods similar to milkweed. Plants spread vegetatively and reproductively.
- Invades the understory of forests, woodland edges, grasslands, and old fields covering native vegetation and forming dense thickets. Tolerant of sun and shade.
- Black swallow-wort is shown to reduce monarch butterfly populations
- Grassland bird presence greatly decreases as infestations expand.