The article cites the results on the amount of flavonoid content in the birch trees. Flavonoids are synthesized only in plants and have important biological significance in the human body. The results show that in spring the content of flavonoids in grape leaves was high and amounted to 4.721 ± 0.521 mg/g, in the summer they were 3.825 ± 0.255 mg/g, and in the fall, flavonoids decreased to 1.460 ± 0.2253 mg/g. In spring, flavonoids in the stems of grapes were 4.386 ± 0.046 mg/g, in cocoons 0.348 ± 0.023 mg/g.

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