Küçük, Gözde2021-12-022021-12-022020http://hdl.handle.net/20.500.12575/76622This research was carried out to optimize the optimum leaf length that could be used to obtain maximum galanthamine without damaging the growth of 9-10 g weight summer snowflake (Leucojum aestivum L.) during October 2017 and July 2019 for two years. The leaves were harvested at ground level, 5, 10, 15 cm above soil level and control (not harvested). Using a total of 600 bulbs, 30 bulbs were planted in each replication. Equally proportionate sand-soil substrate was used for planting. The length of leaf at harvest (cm), the number of leaves, the percentage of galanthamine in the leaves ranged 15.225-20.775 cm, 2.20-3.60 number, and 0.067-0.094% for the first year and it ranged 19.8-23.4 cm, 4.50-5.50 number, and 0.063-0.096% for the second year in the same order. In the second year, the amount of galanthamine in bulbs ranged from 0.326-0.376%. Harvesting the leaves from soil level negatively affected the bulb quantity and the least bulb was obtained. In control application without leaf harvest, one bulb weight and galanthamine amount reached the highest value. It has been determined that different leaf harvest heights have effects on bulb development and the amount of galanthamine in leaves and bulbs.enAlkaloidbulbgalanthaminehplcArticle2902