Smart cities typically involve the digitalization of transport and buildings, energy and communications. Yet urban natures are also becoming increasingly digitalized, whether through processes of monitoring, automation, mitigation, or augmentation. This text considers what "splintering urbanisms" materialize through programming nature as infrastructure. By focusing specifically on smart urban forests, I suggest that the management logics of smart infrastructures attempt to program and transform vegetation and its ecologies into uniquely efficient and responsive urban organisms. In the process, these programs of efficiency have the potential to exacerbate extractive economies and social inequalities that amplify and materialize through the "Internet of nature."