Get Help for Cannabis Plants Problems as Quickly as Possible!

[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 :-)

[Elias2107]

I was using ph- but I will take your advice and keep it on the low with nutrients from now on. I hope it’s not to late for them and that they will still be able to recover. I’ll update if any further problems show up. This advice has been great, thank you allot! 👍

[AGH]

Hello Elias2107!

Glad to see that you're growing! Is this your first grow or have you been growing a while?

Taking a look at your pics and reading your post, it looks like your little seedlings are suffering from what many new growers to - giving their plants too much love!

When cannabis plants are seedlings, they're very tender and fragile (I've never had a kid, but I imagine that's what babies are like?) and while they are resilient thanks to evolution, they can suffer from too much attention and care.

Seedlings are extremely special in that they initially have all the food and nutrients that they need to get started so no nutrients are needed. So if you're giving them any nutrients, that can probably stop for now. They're also sensitive to chemicals so if you're adding any pH-up or -down, you might want to cut back on that as well.

It also looks like your rapid rooters are extremely wet. While water is essential to plant growth, when they are seedlings, their roots don't really have the capability of absorbing much of it. When they first pop, seedlings actually take in more water from their leaves than their roots. If you're thinking, "Gee, maybe that's why seedlings like higher humidity than adult plants?" you're absolutely correct! Also, when seedlings are overwatered, it actually suffocates the roots causing all sorts of problems. Roots need oxygen/air as much as they need water.

Your little seedlings are looking pretty rough, but by going a little more 'hands off' you might be able to salvage them. My suggestions:
- Stop adding nutrients for now until they're bigger
- Stop watering for at least a few days.
- When you do start watering, give them VERY LITTLE (when my seedlings are that big, they just get misted using a sprayer. Once they're growing strong, I start doing about 1 cup (about 250mL) every 2-3 days)
- Also when you water little babies like that, try watering in a circle an inch or two (3-6cm) away from the base of the stem. This helps keep the medium wet without drowning the developing roots.
- And in general, you want your temps to be between 68-77F and humidity 65%-70% during the seedling phase. However, it appears that the watering issue is more prevalent than your environment at the moment.

Good luck, keep us posted, and remember that (usually) less is more with cannabis!

[Elias2107]

I put on the lid again but opened a few holes at the top so there is no to high humidity. Also started giving plants lower EC because they are not taking it so well I think. New EC is around 0.5