Why Lineage Matters

A strain's lineage tells you what to expect. OG Kush (Chemdawg x Hindu Kush x Lemon Thai) inherits chem-family pungency, kush earthiness, and sativa lift. If you know the parents, you can predict the offspring's terpenes, growth pattern, and effects with surprising accuracy. This guide teaches you to read any strain's family tree.

Basic Lineage Notation

Strain lineages are typically written as Parent A x Parent B, where Parent A is the seed-bearing mother and Parent B is the pollen-donating father. A strain described as "Blue Dream (Blueberry x Super Silver Haze)" means Blueberry was the mother and Super Silver Haze was the father.

Grandparent genetics are sometimes listed. For example, Gelato's full lineage is Sunset Sherbet x Thin Mint GSC, where Sunset Sherbet is itself a cross of Girl Scout Cookies x Pink Panties. So Gelato's grandparents include GSC, Pink Panties, and the parents of Thin Mint GSC (which is a GSC phenotype). Most modern polyhybrids have multiple generations of crossing in their background.

Key Breeding Terms

  • F1 — First filial generation. The direct offspring of two distinct parent strains. F1s are the most vigorous and uniform.
  • F2 — Second generation. F1s crossed with each other. More genetic variety emerges as recessive traits appear.
  • Backcross (BC) — Crossing a hybrid back to one of its parents to reinforce specific traits. Often written as "Strain x (Strain x Parent)."
  • Polyhybrid — A hybrid with multiple genetic lines in its background (three or more distinct strains). Most modern strains are polyhybrids.
  • Cubing — Repeated backcrossing to stabilize a trait, creating a seed line that consistently produces a specific phenotype.
  • Phenotype / Pheno — The physical expression of a strain's genetics. Same seeds can produce different phenotypes depending on which recessive genes express.

Using This Site's Data

Every strain profile on this site includes the genetic lineage, parent strains (linked), and known offspring. Use the family tags to explore genetic families — for example, clicking "Cookies Family" on any strain page shows you all strains in that lineage. The timeline page also shows how strains connect across decades of breeding history.

To trace a strain's ancestry: start on its profile page, click through to its listed parents, and continue backward. You'll often find yourself at one of the foundational landraces — Afghani, Thai, Mexican, Colombian — that are the genetic wellspring for everything that followed.