Weed risk assessment (WRA) score in ornamental non-native plant species classified by their invasion status in Spain. P-values for Tukey’s range tests: not in the wild – casual: p = 0.392; not in the wild – naturalised: p = 0.983; not in the wild – invasive: p = 0.951; casual – naturalised: p = 0.101; casual – invasive: p = 0.086; naturalised – invasive: p = 0.997.