Why is steem turned black
Fungal or something else
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I don’t see anything wrong other than you pulling them out of the ground 
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Looks normal. Some show purple stems, red stems or seemingly black stems early in growth mostly related to genetics. It looks healthy to me. Nice root system is forming. 
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They look fine to me, maybe some purpling but that’s 100% normal.
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Genetics Brochacho Nice even green leaves in good shape no sign of deficiency nothing more than what Mother Nature gave her
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This could be the start of Botrytis cinerea, hope not:
have a look on it, if advanced it goes like this:
Do you have really humid conditions? 
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The dark discolorations at the base of the stem of the nearer plug, next to the soil, does look like stem rot
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They will be fine 
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Hope not i will monitor yhem in advance thank you
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Hope not
Hummidity is optimal
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I’m not seeing any problem, zoomed in and everything looks okay to me (dark area at bottom of stems looks to be a little bit of grow medium).
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that was good and I to think they look fine. I would just keep an eye on them to be sure nothing else develops that could be detrimental to your grow 
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Should have took a pic sooner they were so black it looked like someone hit them with a sharpie marker had a growth spurt while I was away
.These afghan heirlooms did that same thing and they grow out of it.Yours unless I’m wrong should grow up and it fades to a purple after awhile you won’t even notice it’s there on some of these plants.It’s whatever is in that plants Genetics and how it responds to your environment.These ones were sensitive to light distance and power I had to put them on the floor under other fan leaves for shade they did that pissy yellow leaf thing and bounced right back into green I’m thinking the plant was producing anthocyanins In response to the light.Feeds were the same with all and had no nute burn or stop in growth per say.Just a hypothesis for now
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