In 1999–2001 years two Rosa × hybrida cultivars, ‘Casanova’ and ‘Korlingo’, were obtained by bud-grafting on a thornless multiflora rootstock (Rosa multiflora Thunb.). The first factor studied was the rootstock quality: class I (base diameter Ø= 4–6 mm); class II (base diameter Ø= 3–4 mm); class III (base diameter Ø= 2–3 mm). The second factor studied was the scion size: thick scions (Ø= 6–8 mm); medium scions (Ø= 4–6 mm); thin scions (Ø= 2–4 mm). The highest rate of rose shrubs was obtained with class I rootstocks, and lowest with class III rootstocks. The biggest number of I class shrubs was obtained on class I and class II rootstocks, and from thick scions, and the smallest number with class III rootstocks. The root system development was best with class I and class II rootstocks. The rate of successful grafts and the quality of the shrubs obtained were not affected by the scion size.

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