The impact of the addition of indole-3-acetic acid (IAA) to three commercial growing media and three self-prepared growing media on rooting of cuttings of two ornamental plants: Hydrangea L. and poinsettia Euphorbia pulcherrima ‘Prestige Early Red’ was evaluated. According to the assessment of root system, length of roots, fresh and dry mass of roots, percentage of rooted cuttings the best rooting of cuttings of Hydrangea L. in Ceres and GM2 and of Euphorbia pulcherrima in Klasmann Steck Medium, GM2 and GM3 independent of the doses of IAA was observed. The addition of 200, 300 and 400 µg kg^-1 IAA for GM2 and GM3 improved some of the parameters rooted cuttings of Euphorbia pulcherrima. The worst assessment of root system and percentage of rooted cuttings for both ornamental plants with the lowest pH in GM1 as compared to other growing media was shown. Furthermore, 400 µg kg^-1 addition of IAA for Klasmann Steck Medium caused significant on higher length of roots and dry mass of roots of Euphorbia pulcherrima.

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