4 hours ago
Backcrossing means taking an F1 and crossing it back to one parent to lock in a trait, then repeating until the offspring come out consistent. It takes several generations and a lot of patience, which is why stable lines cost what they do. Descriptions of the common designations like F2, S1 and BX1 are written up at https://breederregularseeds.com in plain language. Anyone selling an unstable F2 as a finished line is either rushing or hoping you will not notice.