Key Lime BX2 [F]

Key Lime BX2 is a feminized photoperiod cross of Key Lime Pie BX and Key Lime Pie, bred by Sin City Seeds as a second backcross to the original Key Lime Pie mother.

A backcross crosses offspring back to one of its own parents to push the expression toward that parent. One round (BX1) lands at roughly 75% of the target parent’s genetics; a second round (BX2) concentrates that to approximately 87.5%. The practical effect is consistency: where the S1 can throw some variation as recessive traits surface, a BX2 narrows the range so more plants in the pack express the lime profile the same way. Our seed terminology guide sets out the arithmetic in plain language.

That makes this the pick when the goal is to keep a lime pheno rather than hunt one. Our Key Lime Pie strain history describes BX2 as the refined version of the line — two generations of backcrossing to lock the lime in — against the S1’s role as the purest single-plant reproduction.

Sold as a half pack of 3 feminized photoperiod seeds.

Part of Citrus & Lime from Sin City Seeds. Compare with Key Lime Pie S1, the selfed original.