Two field experiments were carried out during the two successive seasons of 2006 / 2007 and 2007 / 2008 to investigate the effect of GA₃ (0, 50, 100 and 150 ppm) and calcium (0, 50, 100 and 150 ppm) as well as their interaction on growth, flowering, chemical composition and bulb production of Crinum asiaticum plants. All concentrations of GA₃ or calcium increased leaves parameters (number, width, length and dry weight of leaves / plant), floret parameters (number, diameter and fresh weight of florets / spike) and spike parameters (number, length, diameter and spike fresh weight), as well as, total carbohydrates and number and fresh weight of bulbs / plant. All concentrations of GA₃ or calcium decreased the number of days to full blooming and extending the duration of flower on plant and flower vase life. Morever, GA₃ at all concentrations decreased whereas calcium concentrations increased the total chlorophylls contents in the leaves. All combinations between GA₃ and calcium concentrations had a positive effect on growth, flowering and bulb production. And the treatment GA₃× calcium at 150 ppm showed the most beneficial effect in this respect.