Peripheral longitudinal growth stresses measurement discloses the mechanical state of the last xylem cells differentiated from cambium. The occurrence of a strain peak is generally an indication of a reorientation movement of the stem. However, it is not a rare occurrence to obtain some more complicated strain profiles. ''Organisation pattern'', a new architectural concept developed by Edelin (1991), seems pertinent to ''unusual'' profiles analysis. This idea is illustrated through examples from temperate and tropical monopodial and sympodial trees.