Cauliflower variety ‘Kuari No.3’ was applied various levels of fly-ash to study their effects on growth parameters viz. leaf area, number of leaves per plant and days to physiological maturity and crop yield. The results showed that, the application of fly-ash did not affect the duration of physiological maturity. However, the considerable increase in leaf area per plant, number of leaves per plant, chlorophyll content and yield (2 to 29 per cent) was observed due to various levels of fly-ash. More pronounced and beneficial effects were noticed with the application of higher dose of fly-ash.