Humboldt SC - Blueberry Pancakes Seedlings (wilting issue)

questions - what's the soil? - do u feed and how much

You’ve already got a pretty solid setup, so don’t worry seedlings are just a bit sensitive at this stage and small imbalances show quickly. From what you describe (wilting + discoloration), a few things could be going on at the same time. First, I would recommend increasing your humidity a bit. 65% is okay, but seedlings usually prefer it a bit higher, more in the range of 70–75%. Also, what is your exact temperature? 71°F (around 21–22°C) is on the lower end. Cannabis prefers it slightly warmer in the veg stage, ideally somewhere between 21°C and 25°C (70–77°F). They really like it warm and humid early on. You should also make sure you have some gentle air circulation. A light airflow helps strengthen the plant, but be careful too much direct wind can actually dry out the leaves and cause that wilted look. If a fan is pointing directly at them, try reducing it. Another important point: since you’re using living soil, it’s possible the plant isn’t getting enough available nutrients yet. The soil biology needs some time to break everything down and make nutrients accessible to the plant. In early seedling stages, this can sometimes lead to slight deficiencies or weak growth. One thing that can really help here is a foliar feed. I often recommend something like BioTabs Boom Boom Spray. Apply it underneath the leaves as a foliar spray it works really well and stays fully within the living soil approach. Overall, I don’t think you’re killing them it’s just a matter of dialing in temperature, humidity, airflow, and giving them a small boost while the soil biology catches up.🙏😊

6.8 is a lil Bit to much .. soak the soil ..

avoid Horrible Seed Company. shady business. Especially if that's a ".es" batch which I just tossed out 4 packs of, I was told the date handwritten "2025" is when it was packaged, not when it was produced, total garbage. When asked for refund, they don't ship overseas, but that's your EU office in Spain, oh well

more of a balancing issue in that soil and possibly just some fugly early growth that the plants will not display in new growth. Those first couple sets of leaves you shouldn't worry beyond the basics. E.g. twisting of that first single bladed leaf.. As long as new growth doesn't show that, it's probably a nothing burger. Oscillating pH will cause wavy growth like that, but also early leaves can show such things never to be seen again. The chlorosis so early is something to pay attention to. Maybe the soil is too hot? I really doubt there are deficiencies at this point, so lockout is the first thing i'd look into. doesn't look like they've been torched, either. node spacing looks healthy from what can be seen. Being recessed in the pots could be part of that, as someone else mentioned. They'll soon be tall enough so that won't matter. something to avoid next time. if nothing fixes it by that point and it clears up, becomes more likely, right? can learn or guess in hindsight better at times. won't be 100% confident, obviously... 6.8 pH shouldn't cause issues in soil, so maybe this living soil is a little too hot for a seedling? heat mats without a thermostat is dangerous. Too warm will deprive roots of O2. This could cause droop. eliminate possibilities with least intrusive methods first :P

Next time fill the cup all the way up. Leaving so much space to the top makes a pocket for higher humidity inside it. Could be causing too much moisture in the space. Can mimic signs of over watering. Also over watering can cause it too. I wouldnt water again till the cup feels light. Also if you dont have one, get a small fan to oscillate around them. Will help with humidity and strengthen the stems. Just dont leave it blowing directly on them. Just a thought. Best of luck! HappyGrowing!.

Feeding plain RO water in living soil is a mistake. RO water should be conditioned to be pH buffered and stable Unbuffered/unconditioned RO water can strip the soil off essential minerals - especially calcium potentially leading to acidic pH swings that prevents the plant from absorbing the nutrients properly On top of that the modern LEDs often increase the plants demand for Calcium and Magnesium beyond what any soil can provide, which is why it's a good practice to supplement it with every second watering or even with every watering in decreased dosage If you want to keep things strictly organic and not use synthetic nutrients you can use dolomite lime at about 1/8tbs per gal. A mix like that should be aerated and mixed for 24h and then pH buffered Hope your plants get better, good luck

What's in your living soil? Get the pH 6.4 and take it off the heatmat feeding only water. If there is holes in the cup get run off to flush some of that hot feed out whatever it might be..

Hey. I'm going to try to help you as best as I can, but I think... 1. The heating mat (Suspect No. 1) Turn it off right now. Heating mats are great for germination (getting the root out), but once the leaves are there, they become dangerous. The problem: In a small cup like that, the mat "cooks" the roots. It creates a warm and humid environment at the bottom, which prevents the roots from breathing. The result: Your leaves wilt as if they’re lacking water (even though the soil is moist) and start to discolor because the roots are suffocating. 2. RO Water + Living Soil RO water is a double-edged sword. The problem: Since it’s 100% pure, it has no "buffering power." As soon as it touches the soil, its pH can swing anywhere, even if you adjusted it to 6.8 beforehand. The result: The "Living Soil" needs minerals (calcium, magnesium) to stabilize the pH. Without that, your plant experiences a nutrient lockout, hence the yellowing/discoloration you see on the young leaves. Did you poke holes in the bottom of your Solo cups? If the water can't drain out the bottom, the roots stagnate in the water, and it's guaranteed root asphyxiation death. My advice: Let the soil dry out well (the cup should become very light) before your next "corrected" watering. Seedlings prefer to have their feet a bit dry than to have their feet boiling on a heating mat! I hope I could help you. Have a good evening!