Comparisons of seedling performances between Australian inoculum addition and soil type treatment combinations. Seedling total dry biomass (A, B), root:shoot ratio (C, D), number of nodules (E, F) and 𝛿15N (G, H) measurements for Acacia saligna (left) and Psoralea pinnata (right) for each site (Grootbos, Kogelberg, Rustenberg, Vergelegen and Psoralea-conditioned (Pc) soils) by inoculum treatment (red – Australian inoculum added; blue – no inoculum added) combination.