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Paper presents results for length of vegetation period as factor in common  oak’s (Quercus robur L.) phenological variability. Trees in two common oaks  populations on two locations in area of Belgrade were researched. Average  length of vegetation period on site Ada Ciganlija is 166 days, while in  location Bojčinska šuma is 179 days. Regarding that populations are in  similar environmental and habitual conditions, differences in results should  be treated as consequence of common oaks intra-specific variability and  genetic structure of population. Significant differences in three consecutive  years of observation are confirmed

Length of vegetation period as parameter of common oak (Quercus robur L.) phenological variability