Abstract
1. Studies were carried out in 1955, in order to investigate the dormancy of seeds of domestic and wild udos (Aralia cordata THUNB.) gathered in Japan. 2. Udo seeds scarecely germinated immediately after harvesting and when they had been in dry storage, while seeds stored in the cold wet sand germinated well. Domestic udo seeds germinated more easily than wild ones. 3. Chilling treatments (0_??_2°C) were very effec-tive to break the dormancy of udo seeds in dry storage. In this case also, domestic udo seeds germinated more easily than wild ones. Varietal differences were observed in the dormancy of do-mestic udo seeds, while there were wide variations in wild ones. 4. Injuring seed coats, soaking in the concen-trated sulphuric acid, thiourea treatment (0.2%), alternating temperature, and washing in the running water were not effective to break the dormancy. Light had no decisive effect on the germination.
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