Е. В. Соломонова The investigation of plants with high bioresource potential from renewable sources, whether native or cultivated in Russia, is of significant importance. Sambucus racemosa L., a European understory species, accumulates fatty oils and is traditionally used in cosmetics and medicine. This study investigated the fruit development of red-berried elder, using fruits collected from the S.I. Rostovtsev Botanical Garden (Moscow) during 2021–2022. Morphological, morphometric, and weight characteristics of developing fruits were analyzed to determine the duration of developmental phases and describe growth dynamics. Fruit development followed a double sigmoid growth curve. A growth and weight increase lag was observed from mid-June to the beginning of the third decade of June. The entire fruit development process spanned eight weeks, from the third decade of May to the second decade of July, with growth continuing for six weeks until early July and ripening occurring over two weeks. Fruit length increased from 3.633 ± 0.008 mm to 4.646 ± 0.014 mm, width from 2.752 ± 0.141 mm to 4.757 ± 0.244 mm, thickness from 2.463 ± 0.127 mm to 4.471 ± 0.230 mm, and weight from 9.145 ± 0.472 mg to 62.340 ± 3.245 mg. Growth dynamics in length, width, and thickness exhibited similar patterns. Following the growth lag, width and thickness increased at a faster rate than length. The obtained data on the growth and development dynamics of red-berried elder fruits are comparable to those reported for Sambucus sibirica Nak.
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