The most important observation about stimulating the development of vegetativeorgans is found for DDW + SB variant, where the percentage ofstimulation compared with the control is 43% for root elongation,59% increase in calathidia diameter, 25% for stem elongation, and39% elongation of leaves. Our obtained results evidenced that thepolyphenolic extract derived from the bark of spruce (SB1) with aconcentration of 130 mg GAE/dm3determines an increase in leaf length