Article 13
1. Reproductive material shall, during all stages of production, be kept separated by reference to individual units of approval. Each lot of reproductive material shall be identified by the following: (a) master certificate code and number; (b) botanical name; (c) category; (d) purpose; (e) type of basic material; (f) register reference or identity code for region of provenance; (g) region of provenance - for reproductive material of the "source-identified" and "selected" categories or other reproductive material if appropriate; (h) if appropriate, whether the origin of the material is autochthonous or indigenous, non-autochthonous or non-indigenous, or unknown; (i) in the case of seed units, the year of ripening; (j) age and type of planting stock of seedlings or cuttings, whether undercuts, transplants or containerised; (k) whether it is genetically modified. 2. Without prejudice to the provisions of paragraph 1 of this Article and of Article 6(1), point (c), Member States may provide for subsequent vegetative propagation of a single unit of approval in the "selected", "qualified" and "tested" categories. In such cases the material shall be kept separate and identified as such. 3. Without prejudice to the provisions of paragraph 1, Member States may provide: (a) within a single region of provenance, for mixing of reproductive material derived from two or more units of approval within the "source-identified" category or within the "selected" category; (b) when mixing of reproductive material within a single region of provenance, from seed sources and stands in the "source-identified" category takes place, that the new combined lot will be certified as "reproductive material derived from a seed source"; (c) when mixing of reproductive material derived from non-autochthonous or non-indigenous basic material with that from basic material of unknown origin takes place, that the new combined lot will be certified as being "of unknown origin"; (d) when mixing takes place in accordance with subparagraphs (a), (b) or (c) that the identity code for the region of provenance may be substituted for the register reference as in paragraph 1(f); (e) for mixing of reproductive material derived from a single unit of approval from different years of ripening; (f) when mixing takes place in accordance with subparagraph (e) that the actual years of ripening and proportion of material from each year shall be recorded.