Another thing, so you dont want to grow the seed especially if it pollinated itself. Thats like making a selfed generation but naturally. I started out liking selfed strains as it means more chances of finding that winner pheno. Its the same with herming, youre concentrating that gene so actually more of the offspring likely to herm.
Yes its feminized but also herminized. So you cross it with a clean pheno same strain assuming you want the same thing just without herm. You replace the herm mom with a offspring that bests fits that replacement identically. This is to purge the herm.
The other pheno you used initially to start this will need to be kept safe. It has good genes, the anti herm genes. The other replacement mother is your traits you want to see and enjoy but you have to keep hunting for.
Because you keep crossing that offspring with that back cross mother pheno you had from the start. That fixes the herm trait the other ever changing mother is suffering from. By pumping it full of those anti herm genes.
Eventually youll have 6-8 generations done of back crossing. 99% of the offspring will now have the same genes so instead of back crossing you can toss that back cross pheno now you see its officially IBL and done. You can make a big batch of seeds before tossing that back cross mom and when need more just cross two IBL phenos.
Keep the old generations especially just prior. To introduce more diverse genes again to fix inbreed depression if mating two IBLs are causing that in offspring after a few decades. Make fresh seeds of previous generations when those start dropping in germination rates. Thats a life time worth of preservation.
You could just clone it when its good enough if you dont want to really breed it out. It just so happens to create a strain. I say all this based on thread title/comments and because I used to see people ask this question all the time. Can I breed out this herm in this beloved pheno. Yes but it can turn into a direction you didnt expect or are willing to keep persuing due to challenges.