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By feeding I mean with nutrients.......never plain water in coco.......ever. Solo cups are just 16oz plastic drinking cups. Never mix coco and soil. They have different pH requirements and soil has to go through a wet/dry cycle, whereas coco has to stay saturated. You can't do organic in...

I grow in coco so I start feeding daily to run off starting around day 3 or 4 from sprout. I hope you plan on adding more perlite to your soil and starting in solo cups. Those plants in the pic I posted are 2 weeks from sprout.

If you start over I suggest using a lot more perlite to aerate the soil and starting in solo cups. Don't transplant until they're this size.

There's clearly a visual difference in the soil between the two larger plants and the problem seedlings.........looks like a lot more perlite, and the soil doesn't look like mud.

I don't see anything in black pots.........unless you mean the new sprouts in containers with aluminum foil covering them. Even though you say you use the same soil........there's clearly a visual difference between the soil with the SLH and your problem seedlings.

It's not the water, or the lights........it's the soil........dense with no oxygen for the roots. I refer you to my post #5. The more oxygen to the roots the better and faster the growth.

That's why I use the drops........cheap and never wrong.

Perfect reply......post #10

Do that and you will prevent the plants from growing to their potential.

Autos don't require a 12/12 light schedule to show sex and flower........they do it automatically regardless of light schedule. I can't guess yield, but I wouldn't expect much.

I agree with all the above posters.

What medium? What feeding schedule?

Coco basics: Feed daily to substantial run off every time........multiple feeds per day is good. The pH should be around 6.0. Never use plain water and never let the coco dry. It looks like you could use better lighting........the plants are stretched and spindly. There is no need to increase...

Just plant the darn things.

Lack of oxygen in the root zone. More perlite would have been beneficial........your soil looks more like mud without aeration. They were too young to transplant. Considering the size of the plants, it'll take a long time for the soil to dry out, and growth will be slow. The soil doesn't dry...

I hope you don't plan on flowering them in that space. If you think things are tight now.........just wait. Good luck.

Your timeline is misleading. Like almost everybody, I start counting at sprout. That being said........your plant is very healthy. Good luck.

So the plant is actually 5-1/2 weeks old.........not 15 days.

When did you start counting veg? How long from sprout?

Not ready to transplant. Forget the roots.......wait until they're about this size before transplanting.