Agrobacterium-mediated transformation and regeneration of spike lavender was carried out according to Nebauer et al. (2000). Acclimatization and maintenance of regenerated plants under greenhouse conditions were accomplished as previously described (Mun ̃oz-Bertomeu et al., 2006). After 2 years, some of the transgenic T0 lines flowered. Progenies of these T0 lines were obtained by selfing (July–August) in controlled conditions. T1 seeds were harvested in October, germinated in vitro as described by Calvo and Segura (1988) and seedlings transplanted to pots and transferred to the greenhouse as previously described. Leaves of T1 seedlings were used to evaluate segregation of LS and nptII genes by PCR analysis.