Analysis of patterns of formation of dimensional parameters of leaf blade of Psidium guajava L. in greenhouse conditions of Donetsk Botanical Garden was carried out. Average parameters of leaf blade length vary within the range from 5.91±0.08 to 19.23±0.21 cm; average parameters of width – from
4.16±0.09 to 8.29±0.09 cm. Statistically significant differences were found in the sizes of leaf blade located in different nodes of the annual shoot. Consistent increase in sizes of leaf blade of the studied species from the first to the fifth pair was noted, then a consistent decrease in sizes was established. A consistent increase in the size of leaf blades located in the first five nodes of the shoots was noted; after reaching the maximum value, a progressive decrease in the size of all subsequent leaf blades was established. Leaf blade length and width parameters show little variation, with the coefficient of variation being less than 10.0 %. A high positive correlation was found between the length and width of the leaf blade of P. guajava.

Zagumenny R.A., Shtirts Yu.A.