I've had seeds pop as late as 22 days when 15 other seeds of the same strain all popped in 1-5 days. Homegrown seeds I use are mostly TGA x TGA, Clone-only x TGA, or other crosses I made of The Purps IBL, Chemdawg IV IBL, and a Durban Poison IBL I've kept going since 2004 from MMJ weed seeds...