hey everyone , I’ve been trying to grow marijuana King kush (not autoflowering) indoors for quite a while and I’m pretty confused because one symptom can mean many things and doesn’t give me a definite answer for the problem My current seedling is almost a month old and here is what happened in steps : 1- the first two leaves that are responsible for providing nutrients to the plant to grow have turned brown and crunchy and died after a week from sprouting 2- yet since marijuana is a resilient plant it continued growing and produced the first two marijuana leaves 3-a week later these leaves started to curl downwards , although I am very careful with watering , it’s in a relatively small pot and I damp a tissue into water and then squeeze it in a circular motion around the seedling trying as much as possible to give it the suitable amount of water it needs , but the curling continues , I thought maybe it’s underwatering , so I increased the amount of water but still the problem continues. 4- two new leaves got out and a week later they are starting to take the same god damn curl downwards. 5- I use soil and perlite and a handful of sand as the soil that is being sold where I live is extremely rich with nutrients that caused nutrient toxicity in my previous plants (over feeding) thus the sand and perlite. 6- the lighting I use is led 260w (2600 lum) is greenish The plant is almost a month old and here are some pictures to help detect the issue , is it a watering problem or nutrient problem ?
Personally I would cut my losses and start over if that's the only progress in 4 weeks. You said soil but it looks more like coco to me. Also - don't use sand in your mix. Consider starting in a solo cup next time.
Agree. That small, mutant plant won't yield much if it even survives. After 4 weeks you should have a much bigger weed.
What are you growing this girl in? I have to agree with MickFoster don't waste time on this seedling cut our losses. But we need to know what medium are you growing in.
Are there any drain wholes in the bottom of the bucket? I would first try to give about 1/4 gal of water then leave it alone and just let it do its thing for 4-5 days. This will tell you If you have been under watering and at this point what's the worst that could happen? Over water it lol. For what it is worth my photos were about that size for a month from under watering and they are doing much better now. What kind of light bulb is that? If you want to keep this I suggest digging a hole around the plant about 6 in. Out and 6 in down and pull that plug out and replant it In a 1 gal. Pot or solo cup. It is one of the hardest things for me to get the watering right and in bigger pots it's just that much harder.
First thing I see is a nitrogen problem. Second thing I see is a pH issue (probably the cause of the nitrogen issue). Third thing is extrapolated from your description... Nutrient toxicity is basically impossible in un-amended soil. The requirements of Cannabis make soil grows an exercise in chasing nitrogen requirements. Commercial soils like what you mention will support Cannabis for several weeks but will require additional nitrogen, at the very least. It is unlikely that you have a deficiency there, but rather a chemistry issue that removes what nitrogen that is there from availability to the plant. Cannabis is a tough and hardy plant but it does have a fairly narrow window of soil conditions where it does well. You mentioned that you used the same soil for a previous grow with the same (or similar results). Adding a bit of sand and perlite isn't going to change that significantly. Fourth, distilled water is not what you want to be using. Certainly kudos for trying to get the best water you can and it would seem to be a good idea, though most folks that use distilled have problems. Save yourself some expense and use RO water (I get mine from the vending machines at the grocery store.) or if you aren't adding nutrients or fertilizers, seek a natural source of water that is clean and pH stable (for soil grows...) I would bet that your soil mix is intended for general houseplants and not acid loving plants. I seriously doubt that you have too much nute concentration (as you haven't added any)... Granted, if the soil you are using is not completely composted, that will also cause issues like we see here. These are from changing or out of range soil chemistry. The fix... First thing to do is discover if the soil is actually out of range. Soil pH tests are inaccurate at best, but it's what we have to work with. If the soil is out of range, then either change the soil or repair the soil. Changing it is the best option as it is fast and complete. Repairing the soil is much more involved and takes a long time. There are many recipes for Cannabis friendly soil blends and with indoor plants, will require some added plant food during the life of the plant. In outdoor plants, one can use enough of the mix to support the plant through it's life. Indoor plants are very unlikely to have sufficient soil volume to support them without adding anything. Here is an article from Maximum Yield magazine that gives a basic overview to generating soil mixes for plants like these. Have a read and see if it makes sense to you. Recipes for Success: Building Your Own Organic Potting Soil
