2 plants 1 seed ?

I agree. When a sprout is badly mutated it never performs well. I have had one that I grew to maturity but it lagged several weeks behind and the yield was 25% (at best) of the healthy plants.

Had this happen once and neither one did any good. Personally I would get rid and pop a fresh seed.

I have had this happen a number of times and sadly they generally are mutants that don't flower properly or have a very high chance of being hermaphrodites. These days I now cull any twin seedlings due to my previous bad luck when growing twin seedlings. Hope this helps, Organoman. P.S. - I hope you have two separate grow spaces, as growing autos and photoperiod plants in one grow space is going to be a problem. Your photoperiod plants won't flower at 18/6 and your autos won't produce much at 12/12. If you are growing outdoors, then no problems, but the autos don't really perform that well outdoors in my experience.