Get Help for Cannabis Plants Problems as Quickly as Possible!

[Elias2107]

The lights have been on 12/12 since 21st of January. They were growing perfect the entire grow until the end came along. Now they have been starting to show some yellowish leaves and are starting to look droopy. I have no idea what the white stuff on the leaf is. The metal thingy I think you mean is a chain used to hold the lamp in place. I also use a mirror and because of this the temperatures can rise a lot too. Last max-min I checked it was around 29 degrees! I lowered the lamp to decrease temperatures. The circulation is good as well with two fans. Any suggestions?

[Elias2107]

I am not growing organically, but I think trimming the lower leafs hasn’t helped a bit. As you said the problem is the same but has moved up now.

[AGH]

So it looks like there may be some relatively minor problems, but before we get to that, two question.

1. (the most important one) How long have you had them on 12/12 lighting? (The answer to this will decide how urgent the problem is, if there are multiple problems which one is most worth pursuing, and what the best plan would be)
2. What is that metal thing the pots are sitting next to in the pic from post #679?

[Franklin]

Yeah I'm with rwise, I see some white splotches on there, it doesn't look like powdery mildew to me but it might be. Also, I disagree with the usual practice of stripping yellowing leaves, IF you're doing an organic grow which sounds like the case here. If that's happening from the bottom up, that's usually a sign that the plant is moving nutrients around. Leave the leaves on there until they're dead because it's a bank of nutrients. Perhaps the reason the problem moved to the upper leaves is now the plant is pulling the nutrients out of the upper leaves and into the buds. You might want to consider a worm compost aerated tea to get some nutrients to it more quickly. I don't know though, man, I'm just kind of shooting in the dark

[Rwise]

Wood takes in N while decomposing releasing it only after being composted.
But whats up with all the white spots? Have you looked for bugs with a 30x zoom?

[Bluey]

Elias2107 How often are you giving them that?

[Elias2107]

I got rid of the lower leaves, but now the higher leaves are doing the same as the lower ones. The problem has only risen to the upper leafs now. I personally think it’s a sickness because the plant is not drinking as much as the other one too. I don’t know what to do to fix this. My soil consists of: my previous mix (which I’m not using now) consisted of: Plagron light mix 50 L, 1/5 perlite, 25 big spoons of plagron mega worm mix, topped of with 15 tablespoons of Eifel gold lava powder. And my nutrients consist of: Canna Flores 80ml, Canna Zym 40ml, Canna Rhizotonic 10ml, 60ml Canna Boost, 40ml Fulvanic Acid (new) pH: 6.2 EC: 1.5. Any suggestions?

[Elias2107]

My soil consists of wood scraps, coco’s scraps, rice husks, green compost tree bark, terracottom, chalk and fertiliser. NPK of 15-10-20. This is mixed with I think 1/4 perlite.

my previous mix (which I’m not using now) consisted of: Plagron light mix 50 L, 1/5 perlite, 25 big spoons of plagron mega worm mix, topped of with 15 tablespoons of Eifel gold lava powder.

Which one is better and what do I need to add to my mix for even better results?

[Blowdout2269]

What's in your soil and how are your watering habits?

[Bluey]

The nightime 18⁰C can you get it over 20⁰C?
Ideally you should be at 25 to 29 depending on RH of course of a day and 3 to 4⁰C below that of a night. I'd try lower the upper humidity if you can without lowering your lower humidity also...but match your temps to RH for a VPD of maybe 1 2 to 1.6 and tune that with your lights...the good leaves will tell you everything you need to know

[Elias2107]

The temperatures are between 18 and 25 degrees Celsius. The humidity has been a little on the higher side a while a go (70%) but now it’s mostly between 45 and 60. The food I gave them last time was (20L): Canna Flores 80ml, Canna Zym 40ml, Canna Rhizotonic 10ml, 60ml Canna Boost, 40ml Fulvanic Acid (new) pH: 6.2 EC: 1.5

[Blowdout2269]

I agree with @Bluey.
Tell us more about your grow?

[Bluey]

Trim those lower fan leaves. Buds are looking good from what I can tell. Check temps, humidity and pH

[Elias2107]

Since last time I posted, sadly my young plants died ;( but I learned some valuable information at least. Now with my older plants, they have started to show some signs of a deficiency and the lower leaves are looking droopy while the upper ones are strong and healthy. Any suggestions

[AGH]

You're most welcome! And if it all ends up going sideways, all that really matters is that you learned something for the next time around. Sure, you were hoping to end up with some tasty buds, but a new wrinkle in your brain is a pretty good runner-up and you'll be able to do better next time :-)