Plant is 11 days from popping through the soil. Hasn't grown in 2 days.

patience growing weed is about time it takes almost 2 months for your buds

 

blogrow? like fertilizer?

 

if you're fertilizing i recommend waiting until the starting fall off

 

Since you're using 11 Liter pots for a plant of this size be absolutely sure that you don't wet all of the soil - you should only water at the plant and an appropriate amount of water - currently like 50ml (ballpark figure!) per day or so. If you wet all of the soil it will be wet for a long time since there's no roots yet in the vast majority of soil to suck up all the water, then there's only evaporation left to get rid of the water. Also any water that just evaporates will leave nutrients in the soil so it can build up.
Make sure the soil dries out properly between watering. It should only feel lightly moist and nowhere near wet when you water again. Too much water can certainly halt growth - but your plant looks pretty fine to me, so...

I'm not sure about the LED lighting but it seems to be at a reasonable distance. No stretching and it's been growing fine till now.

Are pH levels good? Hard water can have pretty damn high pH. Mine is 8,5.

You don't want to add nutrients at this stage, especially if there's any sort of nutrients already added to the mixture you're growing in. Then it is better to wait till it starts to show minor symptoms of deficiency as that is much less harmful than giving it too much causing nutrient burn.

Patience... Take a picture straight down now and take one in 12 and 24 hours or something, you'll likely notice the most recent leaves will grow in that timeframe, if not by much at least a little.
Don't be tempted to give it nutrients or additional water, just be patient.

Good luck!

// zpdr

 

A bit difficult for me to judge the colour of the plants due to the purple'ish light from the LEDs, so no clue if one is more or less green than it should be xD
But overall the shape and form looks okay to me!

To judge from the pictures your soil mix is mostly peat moss with a bit of perlite, right? No leca, stones or gravel?
In that case you probably want to give it 2-3 days between watering, allowing the top few inches of soil to get completely dry and the lower levels to be slightly moist but not wet. It seems the most common mistake is overwatering, so if you're around the plants and can check on them fairly often try to avoid watering until you get too scared by the look of the dry soil or preferably till you actually see visible signs of lack of water.

Temperatures seem good overall, but as far as I can tell concencus seems to be that slightly warmer is better and should aid growth, so 25-26 is better than 21-22. I have my plants of roughly the same age as yours (photoperiod though, not auto) at 26 to 28°C and between 35 and 45% RH - a bit low RH according to many people out there but I've got no issues so far. I wouldn't go above 55-60% RH for anything but clones (they need 80%+) since it only seems to have some undesired side effects with high RH.

You might want to check the pH of your water. I've had some weird issues with especially one plant and a few other plants with differing symptoms in an otherwise identical setup. Plants about the same age as yours.
It turned out my tap water was 8,5 pH so I tried to adjust it down to around 6,0 using a few drops of lemon juice and within 24 hours after watering there was a clear improvement overall with regards to these weird symptoms that I previously couldn't figure out what was. I can only attribute the problems to my water being too high pH since changing just that thing resulted in immediate improvement. Tap water isn't just tap water.
You can use a cheap test kit from GHE or similar that can measure the range around 4 to 9 or so.

It can happen that seelings simply die early on after initially looking and growing properly, but as far as I understand that shouldn't happen this late when it has properly developed a few set of leaves - but I'm not really sure about that.

// Zpdr

 

Good advice there. Get a cheap ph pen or a ph test kit and make sure you aren't way out of balance. I've seen good results anywhere from 5.8-7.0. Outside that you'll run into some funky stuff. An EC meter would be a good investment too. My tap water is 7.8ph and 748ppm which alone will cause all sorts of issues with the plants. Get some spring water or distilled if you don't want to test your tap. It's usually fine as is. maybe add a little calmag if you do go bottled.

 

You're welcome!
Considering how much it costs just to power the lights for a month.... you can get a pH test kit for something like 10-20% of that amount of money... So IMO it really isn't worth not getting right away, even 5% increased yields and you're way past breaking even on that investment.

// Zpdr