It was shown that wintering grain and fodder cereals (winter-annual and alternate) that enter winter at the phase of tillering are able to form efflorescence at the same time in spring, even if they are grown under different light regimes (continuous illumination, long and short light day, and darkness), as long as they are kept at the same air temperature. The temperature 20-25°C is most favorable; at lower temperatures, the process is slower. It was shown that in autumn, nutrients necessary for efflorescence formation are accumulated, but the nutrients do not enter the cone apex until later. After vernalization, the capacity for inhibition is lost. The types of development, length of vegetation period, and resistance to unfavorable conditions are determined by the degree of inhibition at the phase of tillering. © 1998 MAEe Cyrillic signK Hayκa/Interperiodica Publishing.