The production of viable fruits and seeds under new living conditions is an important index in the process of adaptation of plants, proving the ecological plasticity and the success of their acclimatization. This paper reports the results of the study on seed quality of three new grass species introduced into the collections of the „Ornamental Plants” Laboratory of the „A. Ciubotaru” National Botanical Garden (Institute): Lagurus ovatus L., Chasmanthium latifolium (Michx.) Yates, Coix lacryma-jobi L. The germination capacity, energy and germination power of the seeds were determined. Germplasm quality depends on: climatic conditions during flowering and fruiting, harvest period, storage and germination conditions. We would like to highlight the species L. ovatus and C. lacryma-jobi, the seeds of which had a germination capacity of 75-100%, both under controlled conditions and in open field.