Sorry about your bad luck with the seeds. Maybe they were just a bad batch, I don't know. Don't give up on those others, though, till you're sure they are dead.

Get rid of that heat mat with the seedlings. Keep them at or just below room temperature. I have had good success getting females by keeping them on the cool side (65-68) for the first three weeks of their life.

If you do end up with a male and female consider making a batch of seeds for yourself just in case of emergency and as a way to store genetics. When you get to that point I will be happy to help you.
Perp Reviewed by Perp on . Sad situation I put ten recently purchased (from a very reputable store in Amsterdam) Blue Haze seeds in a lukewarm glass of water for a few days until they all sank, and then planted them in nice seed start mix and with a lovely warming pad...and only 4 germinated, and of those 4, one is a runt that I doubt will survive. So I waited a few more days, then I gently exhumed the seeds that weren't coming up- and they looked the same as they did when I planted them! So I plunked them back into the water and put Rating: 5