Performance in intraspecific competition at pot-level depending on invasion status and soil type (left bars in darker colours show the nutrient-poor and right bars in lighter colour the nutrient-rich soil type). Performance is shown as a establishment success (n = 527/156 in the nutrient-poor/nutrient-rich soil type) b square-root-transformed aboveground biomass per pot (n = 451/143) and c total number of capitula per pot (shown on a log-scale, n = 449/143). The asterisks show the mean performance per invasion status group and soil type.