Figure S1. Figure showing raw biomass data.

Figure S2. Figure showing the relationship between the feedback effect of Jacobaea vulgaris on each species and the reciprocal effect of the species on J. vulgaris.

Figure S3. Figure showing ordination diagram (CA) of the plant community composition surrounding J. vulgaris plants in each field.

Table S1. Table presenting characteristics of each of the ten old-fields for which the weighted community plant–soil feedback was calculated.

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