In a laboratory experiment germination viability and germination capacity of seeds after application of aqueous extracts prepared from the 40 medicinal plants were determined. The seeds colonization by microorganisms was also investigated. According to the obtained results it was found that the viability of the seeds (germination viability and capacity) and its infestation by microorganisms differed significantly depending on the oily plant species, herbal plant species and method of extracts preparation. Germination viability increased by +4.37%, the germination capacity of +38.44% and the infestation was reduced by –43.23%. In both research terms significantly most preferably on the vitality of seeds influenced extract from Z. mays, while the germination capacity in both terms was the strongest limited by extracts prepared from S. alba and S. purpurea. The seed infestation by microorganisms was limited by 75% of investigated herbs, especially extracts prepared from L. officinalis, P. sylvestris and C. sativum.

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