Iron (Fe) is an essential micronutrient for plant productivity as well as for the quality of their derived products. However Fe is generally poorly available to plants because it is mainly present in the soil in the form of insoluble chelates. We and others have recently identified a novel mechanism involved in plant Fe acquisition that relies on the secretion in the soil of coumarin compounds (secondary metabolites) through the PDR9 transporter in order to improve the Fe mining capacity of the plants. Results we have recently obtained allowed us to pinpoint that the coumarin secretion process follows a complex and yet undescribed pathway involving various cell types and proteins involved in their transport. Understanding the whole dynamics of coumarin transport and secretion into the soil is therefore the next challenge we need to tackle. Hence, addressing this issue is of primary importance if one aims at improving food crop production as well as providing better food for the growing population without the use of Fe fertilizers that is expensive and can be questioned in term of sustainability in modern agriculture.