A morphological alteration of ‘Kyoho’ grapevines by CCC [(2-chloroethyl) trimethyl ammonium chloride] was studied. CCC retarded elongation of primary shoots and primary lateral shoots. The former was due to a retardation of cell division and cell elongation, the latter mainly to a suppression of cell division. Effects of CCC were different from tissue to tissue of the grapevines. In the pith, both cell elongation and cell division were depressed by CCC, but in the starch sheath located in inner cortex, cell division was mainly depressed by CCC. The internodes and nodes were thickened by treatment with CCC. The thickening growth of internodes of the primary shoots with CCC was based on a remarkable development of xylem in particular and of phloem. The thickening growth of the primary lateral shoots with CCC was also similar to that of the primary shoots, but was not remarkable as compared with the primary shoots. Development of tendrils of the primary shoots were inhibited with CCC. Those of the primary lateral shoots were also scarcely induced with CCC as well as treatment without CCC.