Blog/Bx1 and Bx2: returning to a parent
Genetics · 30 Aug 2026 · 6 min
Bx1 and Bx2: returning to a parent
A backcross is not a remix. It is a keeper walked back to the cut you actually wanted.

Bx1 means the hybrid was crossed back to one parent once. Bx2 means twice. Each return piles more of that parent’s alleles into the pack. Scatter drops. So can vigour, if you go too far — that is inbreeding depression, a separate note.
We backcross when a cut is worth locking. Durban Poison Bx2 is two returns to our Durban: liquorice locked, sativa spark kept. Orange Apricot Bx1 is one return to lock stone fruit. Jammy Dodgers Bx1, Black Punch Bx1, Strawberry Truffle Bx1 — same idea, stopped before the line goes quiet.
What a Bx is not
It is not an F1. An F1 is the first cross of two lines — heterosis, spread, a hypothesis. We do not pack F1s because the pedigree looks expensive. Apricot Punch is a recombination of two keepers we already trust, which is a different sentence.
Lineage on the label is the actual return. Di Frutti × Di Frutti on Strawberry Truffle Bx1 means the fruit parent was walked back to itself. If we do not know the parent, we do not print a fairy tale. Souvenir seed. Regular. 18+.
Seeds are sold as souvenirs and for genetic preservation. 18+. Cultivation of cannabis is illegal in the UK without a Home Office licence. These notes are not a grow guide.
