Non-uniform germination of reed caryopses (from 0% for most samples to over 90%) at relatively stable temperatures (21 ± 1.9°C and 31.7 ± 1.0°C) and constant light was observed. On the average 70% of caryopses (panicles) kept in room conditions for 3, 5, 10, 20, 40, and 120 days from harvest showed a loss of the ability to germinate only in conditions of culture with a small amplitude of temperature variations (21 ± 1.9°C).