Hybrid vigor such that an F1 hybrid falls outside the performance range of cannabis parents with respects to some character or characters – usually applied to size, the rate of growth or general vigor.
Merriam-Webster Online Dictionary
heterosis (noun)the marked vigor or capacity for growth often exhibited by crossbred animals or plants - called also hybrid vigor
Hybrid vigor, Outbreeding enhancement, Crossbreeding advantage, Genetic superiority, Hybrid advantage