Thus, the use of urea can be used as inducer for increase of carbon, favoring the growth and development when it is also associated with the regulators. This was observed during in vitro cultivation of Hyssopus officinalis L., when adding N-phenyl-N'-benzothiazol6-il-urea (UNP) in the culture medium. UNP is a new derivate from urea associated with cytokinin, which in this case made a significantly better performance possible in terms of percentage of bud propagation and root formation (Rolli et al., 2011).