Almost all steps of growth and development in geophytes are controlled by seasonal thermoperiodicity. Although there have been many studies on temperature effects, which regulate the growth cycle of bulbous plants, the data obtained for different species are not directly comparable. We can certainly make inferences from concepts developed in different species concerning temperature-dependent growth. However, more thorough research of bulbous species is needed to provide considerable progress in understanding the correlation between seasonal thermoperiodicity and the annual growth cycle of geophytes.