On the left, overall preference ratings of respondents for Ailanthus altissima in four different urban contexts (see Fig. 2). Different letters indicate significant differences (Tukeys HSD p < 0.001 for a to c, a to d, b to c and b to d, p < 0.01 for a to b and p < 0.05 for c to d). On the right, preferences are differentiated between practitioners and laypeople.