The subject of the present invention is a grain mixture comprising: - clover seeds of the genus Trifolium chosen from the group comprising Trifolium pratense, Trifolium repens, Trifolium arvense, Trifolium fragiferum, Trifolium dubium and their mixtures, and - fescue seeds of the genus Festuca selected from the group comprising Festuca arundinacea, Festuca capilata, Festuca heteromella, Festuca heterophylla and their mixtures. Another subject of the invention is the use of a grain mixture as defined above in a depollution process based on the principle of phytoremediation.
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