The study focused on the variation of growth performances of grevillea (Grevillea robusta Cunn.), an important multi-purpose tree, also known as silky oak, of Australian origin and used in many countries, including Brazil. The trial was conducted by the Brazilian Agriculture Research Corporation (Embrapa) and Itaipu-Binacional, and assessed in collaboration with the Federal University of Paraná (UFPR). A half-sib family trial was established with seed from different geographical locations throughout the species natural range. The study sought to identify fast growing families and individuals for timber and shade production. Significant differences among families were found, and recommendations were made for a selective thinning to transform the progeny test into a mixed provenance seedling seed orchard.