I had some homemade seeds [ 50%Col. x OG 94% (Bx's)] that i stratisfied
by drying indoors for weeks, refrigerating for weeks, freezing for more weeks, and thawing out in fridge for ~1month.
Planted em along with other varieties in RW cubes & Keept moistened as usual, but after weeks w/o germinating, set them aside in warmer area. Over the following months, found cubes dried out couple times - quickly rehydrated.
Amazingly, one day walking by noticed one etiolated already - It'd been 8 months
Shortly thereafter another one sprouted!!
Unfortunately - 1st one got mortally dried out.
IIRC, it grew into a healthy female - but obviously not memorable keeper.
"Believe in the Seed"