Backcross

In a typical backcross, a breeder starts with a prized parent strain (P1) and crosses it with another strain to create an F1 hybrid. The F1 is then crossed back with P1 to produce a BX1 (first backcross) generation. This process can be repeated multiple times (BX2, BX3, etc.) with each generation pushing the genetics closer to the original parent while retaining selected traits from the other parent. Generally, three to four backcross generations are sufficient to stabilize the desired characteristics.

Backcrossing is commonly used to add a single trait to an otherwise excellent strain. For example, a breeder might backcross a high-THC strain with a mold-resistant variety to create a version that retains the potency and flavor of the original but gains improved mold resistance. Backcrossing is also used to feminize seeds and to preserve rare or heirloom genetics by incorporating them into more commercially viable plant structures. When you see BX in a strain name, it indicates backcross genetics.