It's not foolproof, but in essence the seeds aren't supposed to possess the chromosome necessary to produce males. That's not saying it's impossible for 'femmed' seeds to produce males. Because they will, it just seems the likelihood for males is lower.

Here's a good thread where several growers experimented with femmed seeds, producing them and growing them: Hermie Thread. NEED ANSWERS And a slightly older one: Hermie solution - confirmed!

Hope those help. :jointsmile: