Genetic Modification of Trees 230 experiments thus far involving at least 16 countries and 24 species, more than half since 2002 230 experiments thus far involving at least 16 countries and 24 species, more than half since 2002 Sites kept secret Sites kept secret One Canada plot of Bt spruce and poplars planted outside Quebec City, 2006 One Canada plot of Bt spruce and poplars planted outside Quebec City, 2006 Trees sterile Trees sterile