What does F2 mean?

F2 (filial 2) is created by either self-pollinating an F1 plant or crossing two F1 siblings. Where F1 is uniform, F2 is wildly variable — the genetic deck is reshuffled and recessive traits suddenly appear.

This is the breeder's playground. F2 populations are where you find unusual phenotypes — the candy-flavored cut, the purple-expressing keeper, the sativa-leaning outlier in an indica line.

F2 packs are not for growers who want consistency. They're for hunters: people willing to pop 20+ seeds, grow them out, and select the standouts for further work.

F3, F4, F5 and so on continue the inbreeding — each generation increasingly homozygous and stable. An IBL (inbred line) is typically considered stable around F5–F7.

Why F2 hunts produce the most exciting plants

F2 is where Mendel's recessives surface. The candy-leaning pheno hiding in your F1 dad, the purple expression from grandma four generations back, the unusual leaf shape from a forgotten landrace — they all appear here.

1. 1
   Pop a large pop

   30–50 minimum for an F2 hunt. Smaller pops just don't sample the variation.
2. 2
   Document everything

   Day-by-day photo of every plant. Future you will need the receipts.
3. 3
   Don't cull on vigor alone

   The slowest-vegging plant is often the one with the most distinctive flower.
4. 4
   Smoke test

   Score in cure. The plant that wowed you at week 9 may fade in the jar.