Saffron is a cash crop that most of researchers believe it is indigenous crop of Iran [1]. In order to study the effects of corm density and corm weight on growth characteristic, flowering and economic yield of saffron (Crocus sativus), a field experiment was conducted as factoriel based on randomized complete block design with three replications, during 2009 and 2010 at the Agricultural Research Station, College of Agriculture, Ferdowsi University of Mashhad, Iran. Three corm weights (2-4, 4-8 and 8-10 g) and three corm density (50, 100 and 150 corm per m2) were allocated to the first and the second factors, respectively. Results indicated that the simple effects of corm density and corm weight on leaf and corm cover dry weight, leaf length, numbers, diameter and weight of daughter corm, numbers of flowers, flower fresh weight and economical yield of saffron were significant (p≤0.05). Also, the interaction effects between corm density and corm weight were significant on the weight of daughter corm. With increasing corm density, the growth characteristics and economical yield of saffron were decreased. The maximum and the minimum economical yield of saffron were observed in corm density with 50 corms per m2 (0.88 Kg/ha) and 150 corms per m2 (0.47 Kg/ha), respectively. Also, the highest and the lowest saffron economical yield were observed in the corm weight with 8-10g (0.98 t/ha) and corm weight with 2-4g (0.39 t/ha), respectively. Therefore, it seems that the determination of appropriate levels of corm weight and corm density increased the flower number and economical yield. Therefore, it seems that the determination of appropriate levels of corm weight and corm density increased the flower number and economical yield

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