The influence of the spin orientation of free and unpaired protons of ortho-water in a growth solution on the morphological and kinetic parameters of the dislocation centers of growth of the (0 0 1) face of a TGS (triglycine sulfate) crystal was studied by precision methods, It was shown that the protons' spin orientation towards the crystal surface has no noticeable effect on the hills' shape and causes a decrease of about 11% of the normal growth rate. The spin-lattice relaxation time (T-1) of the growth solution has been experimentally determined for the first time The experimental result of 2.1 +/- 0.1 s and that calculated based on literature data are in good agreement. (C) 2014 Elsevier B.V. All rights reserved.