Environmental (a) and socioeconomic (b) impacts of invasive and potentially invasive ornamental plant species. P-values for Tukey’s range tests for environmental impacts: not in the wild – casual: p = 0.833; not in the wild – naturalised: p = 0.498; not in the wild – invasive: p = 0.926; casual – naturalised: p = 0.904; casual – invasive: p = 0.997; naturalised – invasive: p = 0.845. P-values for Tukey’s range tests for socioeconomic impacts: not in the wild – casual: p = 0.790; not in the wild – naturalised: p = 0.526; not in the wild – invasive: p = 0.916; casual – naturalised: p = 0.947; casual – invasive: p = 0.994; naturalised – invasive: p = 0.875. Dashed red line represents the global median of impacts and the threshold for species in the Attention List (at and above the line, Table 3) and Watch List (below the line, Appendix 2)