The samples were collected from nine rosemary adult plants growing in a nursery located in Montevarchi (Italy). Foliar, cortical and xylem tissue samples were collected at determined heights and horizontal positions on the plants, following the sampling procedure indicated by Squillace [36]. Mechanically damaged or diseased plants were not sampled.

Samples of young, newly developing tissues from the plant parts of the current-year growth, and one-year-old mature tissues were collected separately and brought to the laboratory. The samples are indicated by letters as follows: L = leaf, B = cortex, X = xylem tissue, Y = young and M = mature tissues. Furthermore, mature leaves were collected in the upper part (u) and at the base (b) of the branches.

A total group of 63 samples of these tissues (LY, LMu, LMb, BY, BM, XY, XM) were submitted to the GC analysis, and 18 samples from leaves (LY and LMu) were selected for the quantitative evaluation of the phenols by HPLC/DAD/MS.

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