In view of the importance of black locust (Robinia pesudoacacia L.) in afforestation programmes in northern Pakistan, four different trials of containers were used to see their effect on the growth or biomass of young seedlings of the species. Depot was efficient to allow longer and better developed root system as compared to other containers. Total biomass of seedlings in depot by mid-fall was also greater. Seedlings raised in polythene bag competed with depot seedlings till late summer but the former excelled in most of the growth parameters in subsequent period.