The existence of a tightly regulated balance between growth and immunity in plants has recently emerged. In this study, we challenged this concept thanks to the biological model pyoverdine-Arabidopsis thaliana. Pyoverdine is a siderophore produced by the plant growth promoting rhizobacteria Pseudomonas fluorescens C7R12. Under iron deficiency, P. fluorescens excretes the iron free form of pyoverdine (apo‐pyo) in the soil. Once chelated with iron (ferri‐pyo), the complex is internalized by the bacteria. We demonstrated that Arabidopsis thaliana plants treated by apo‐pyo in a medium containing or not iron internalize pyoverdine. Interestingly, apo‐pyo-treated plants did not show a typical growth reduction induced by iron deficiency. Accordingly, the expression of genes related to growth, development and iron uptake/transport was induced, these latter being involved in the growth improvement induced by apo‐pyo under iron deficiency. In contrast, a strong down-regulation of the expression of genes related to immunity was observed. Furthermore, the resistance to the fungal pathogen Botrytis cinerea conferred by iron deficiency was partially impaired following apo‐pyo treatment. The overexpression of the HBI1 transcription factor, known to be involved in the growth‐immunity tradeoff, was linked to the above observations. These apo‐pyo effects were not observed after treatment of plants under iron sufficient conditions, indicating that apo‐pyo effects are dependent on the plant iron status. To conclude, this work draws first elements of pyoverdine effects on plant physiology. In a larger view, this work supports the recent concept of the existence of a cross‐regulation between growth, immunity and iron homeostasis in plants.