Bulk single crystals of undeuterated Hydrazonium I.-tartrate (HLT) an organic crystal have been grown by the isothermal solvent evaporation method. The occurrence of coloration of HLT solution which is reported to have hindered the growth of HLT crystals under normal ambient conditions has been deferred to a considerable duration by modifying the experimental conditions to facilitate the crystal growth. Studies such as powder X-ray diffraction (XRD) and Carbon, Hydrogen and Nitrogen (CHN) analysis confirmed that the crystals grown using modified growth conditions are indeed HLT. The powder second harmonic generation (SHG) efficiency of the HLT analyzed using Nd:YAG laser was about 1.5 times that of potassium dihydrogen phosphate (KDP), which is higher than the reported value. Dielectric tensor measurements exhibited the anisotropic nature of HLT single crystal. Optical transmission studies performed in the range 190-1100 nm revealed that the undeuterated HLT crystal could be suitable for optical applications. (C) 2013 Elsevier By. All rights reserved.