Forestry scientists have found a way to arrest the development of flowers in poplar trees, paving the way for control of the unintentional spread of engineered or non-native tree species. “Our goal isn’t to make reproductively modified trees just to have that trait,” said Amy Klocko, postdoctoral scientist in the College of Forestry at Oregon State University. “It’s to prevent genetically modified or non-native trees from spreading, either to wild forests or to other plantations. This would help alleviate concerns over gene flow, whether for scientific or ethical reasons.”