The present investigation was carried out in the form of different experiments to find out the effect of organic inputs on certain growth and flowering characters of pumpkin in the Department of Horticulture, Faculty of Agriculture, Annamalai University, Annamalainagar, Tamilnadu during the year 2012.And it was undertaken with various organic inputs such as FYM (25 t ha-1), Vermicompost (5 t ha-1 ), Pressmud compost ( 5 t ha-1),Poultry manure (5 t ha-1 ), Neem cake (5 t ha-1) and Humic acid(85%) as soil application @50 g ha-1 which comprises 13 treatment combinations including absolute control under Randomized Block Design with three replications. The observations were registered on the following growth and flowering aspects viz., vine length, number of branches plant-1, number of leaves plant-1, leaf area, days to male and female flowering, number of male and female flowers plant-1.The treatments have the significant influence on the above characters and the results revealed that the treatment combination of vermicompost @ 5t ha-1 with concentrated humic acid (85%) as soil application @ 50 g ha-1was found to be the best with the fruit yield of 29.61 t ha-1.