A CHEMICAL LABEL, PLUG THEREFORE AND PLANT WITH THIS LABEL.

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Rare earth metals, used in concentrations well above the background concentrations, will be distributed throughout a plant due to the hydraulic architecture and sap flow, and the relative proportions of the added rare earth metals remain unchanged in all parts of the plants. Thus growing plant material can be marked using a chemical label comprising rare earth metals, and the origin of plant material later determined by analysing a sample.