e germination behavior of 11 medicinal plant species under different temperatures was studied. Seeds of all species were exposed to eight constant temperatures ranging from 5–40 °C. A linear model was applied to describe the germination rate-temperature relationship. Tested species showed clear differences in temperature requirements for seed germination.e highest germination percentage was observed within the ranges of 15–25 °C forMarrubiumvulgare L., 15–30 °C for Origanummajorana L., 10–30 °C forHyssopus officinalis L. and Silybum marianum L., 10–25 °C forymus daenensis Celak subsp. daenensis and Ocimum basilicum L. Germination of most species ceased or highly declined at temperatures of 35 °C.e highest germination rate was observed within temperature ranges of 15–30 °C for Nepeta racemosa Lam., Oenothera biennis L. and H. officinalis, 10–25 °C for O. basilicum and Salvia nemorosa L., 20–25 °C forO.majorana L. and T. daenensis and 10–30 °C for S.marianum.e lowest base temperature was observed for Salvia sclarea L., S. nemorosa, H. officinalis and Centaurea benedicta (L.) L. All medicinal species studied in this research had a low, below 5 °C, base temperature. Optimumtemperature ranged from13–24 °C, and the lowest optimumtemperature belonged to C. benedicta.ese germination requirements are insufficient tomake a general conclusion for introducing the species into cultivation, however, these data provide basic temperature requirements for further research.

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