Polygonum sachalinense F. Schmidt ex Maxim, syn. Fallopia sachalinense Ronse Decr., Reynoutria sachalinense Nakai (Polygonaceae) is an herbaceous, perennial plant widely distributed in northern Japan and has spread to North American and European countries, species with intensive growth which provides animals with qualitative fodder. This plant is strongly rhizomatous [2.3]. Under the conditions of the Republic of Moldova, it can grow up to 4-5 m tall.  Seed means the beginning of a new life, the environmental conditions for each species, the seed must pass from latent to active life and give rise to a vigorous plants. [1] Depending on the position of the cotyledons, Polygonum sachalinense belongs to the category of plants with the germination epigenous, cotyledons are removed from the soil surface as a result of germination. Overcoming rest semen or reaching maturity physiological seed has a special importance for attending and completing the process of germination. Determining the potential of the germinating Polygonum sachalinense species, will allow future use, in agriculture, of seeds with high energy, in such a way not to feel loss at harvest. Under the conditions of the Republic of Moldova, Polygonum sachalinense forms viable seeds, but their viability depends on the storage period, as the seeds are kept longer, the more decreases viability.  The table reflects the values of germination of the seeds of P.sachalinense, with prolonged storage.     Tab.1 Seed germination of P. sachalinense with different storage period At the harvest of 2014, we obtained effective values in seed germination, as compared with samples analysed in previous years 2011-2013. With increasing storage, seeds become inefficient, in 2-3 years are lost 60-80% germination.