The experiment evaluated the effect of plant extracts on germination and contamination of Vicia fabia seed “Bobas” variety of horse beans. The materials used for the studies were aqueous extracts made of 40 plant species. The studies aimed to indicate those plant species, which extracts limited their contamination, simultaneously having a stimulating impact on seeds germination. The germination capability of seeds stimulated extracts from green parts of Satureja hortensis, Zea mays stigmata, Verbascum thapsiforme flowers. The number of seeds colonised by microorganisms was limited by extracts from Zea mays stigmata, Taraxacum officinale roots, Urtica dioica leaves. The analysis of the germination capability of seeds and their contamination by germs showed that extracts prepared in the form of brew had the most favourable effect. All forms of extracts from green parts of Artemisia vulgaris,Taraxacum officinale roots,Urtica dioica leaves had the most favourable effect on germination of horse bean seeds and at the same time on limitation of their contamination.