Abstract
The seasonal growth rate of seven species of herbaceous perennials was analyzed under conditions ofintroduction to determine the adaptation mechanisms, biochemical parameters (Nbi, Chl, Flv) in their leaves for thesummer period. According to the duration of the growing season, one rhythmological group and three phenorhythmotypeswere distinguished: long-growing-spring-summer-green, spring-summer-fall-green and spring-summer-winter-green.The maximal values of nitrogen balance, Chl, Flv in Senecione morensis, Helenium hoopesiia and Paeonia anomala havebeen observed in the budding and mass flowering phase, the minimal values have been found in Primula macrocalyxduring fruiting period. The results obtained were statistically significant when comparing median biochemical parameters(Nbi, Chl) in the species Centaurea dealbata, Senecio nemorensis, Primula macrocalyx, Paeonia anomala, as well as(Flv) in Helenium hoopesiia for the period (June-July), with p < 0.05.
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