Abstract: This research was carried out to determine the most appropriate sowing time in Spring under the ecological conditions of Samsun, Turkey during growing period of red podded bean in open field by benefiting from the relationships between plant growth and development, plant light interception. Therefore, four cultivars (Toya, Gitan, Barbunya oturak, Sirik-97), which have been currently started being grown in this region were sown in three different sowing times (16 April, 1 May and 16 May) at 2001 and 2002 years. The plant height, the stem diameter and leaf number were the highest for the plants from seed sowing on 16 April and 1 May. It was also determined that when sowing time was late, there was slight decrease in the plant height, the stem diameter and leaf number. It was determined that there was a significant and positive relationship (R=0.88) between the plant leaf number and pod yield. The highest plant light interception values were measured on 16 April and 1 May sowings however it changed according to the cultivars. When sowing time was late, plant light interception values in all cultivars decreased. According to the results of this research, it can be recommended that the seeds could be sown between 16 April and 1 May in order to have maximum growth and development of the cultivars and also to have top quality and high yield in red podded bean growing.