I grow both of these but one planted Fall of 2014 and one fall of 2005 so it's too early to help much. Negritianka is climbing on John Cabot rose and climbed 6 ft last year and had quite a few blooms. It doesn't seem to be especially bushy and this year it is really taking off Romantika has yet to bloom but the vine seems very vigorous and the stems are thick and sturdy. I live at 4200' elevation so my growing season is short compared to most people but I'm pleased with how well these clems are growing.