Osama Bong Loadin'
Well-known member
F1 vigor sounds like a theory. The more you inbreed the more you lose it. And some stuff is just vigorous aka sativas.I liked the Tom Hill theory .
Several parents reversed , selected and reversed again , repeat . Each reversal is equal to 2 1/2 generations of M/F breeding . After s3 the plants are very inbred .
Then take the two best examples and reverse one onto the other . F1 vigour .