BREEDERREGULARSEEDS

Heterosis, often called hybrid vigor, is one of the main reasons breeders cross unrelated lines. Choosing cannabis seeds for breeding from two genetically distant populations tends to produce a first generation that grows faster and yields more than either parent. The effect weakens when those hybrids are bred among themselves, as traits begin to separate in the second generation. That later variation is where most selection takes place, since it exposes combinations hidden in the first cross.