L-alanine crystal is a Nonlinear Optical (NLO) active amino acid and it is useful for the future photonic technology. Solubility and nucleation temperature were measured for L-alanine at different saturation temperatures and the sample of this work has positive temperature coefficient of solubility. Metastable zonewidth was obtained from the difference between the saturation and nucleation temperatures and it is observed to be large at higher temperatures. Induction period measurements for the selected supersaturation levels at different temperatures were carried out for supersaturated aqueous solutions of L-alanine and it is noticed that induction period decreases with supersaturation ratios. The critical nucleation parameters were evaluated based on the classical theory of homogeneous nucleation. The bulk crystals of L-alanine have been grown from the optimized growth parameters and at different supersaturation levels. Single crystal XRD studies and SHG measurement were carried out for L-alanine samples grown at different supersaturation levels.