Please help :) Flowering Auto showing problematic symptoms

Flanagan · Jul 16, 2025

Hello all!

I'm new here and to growing cannabis. I do it for fun and I have 4 little, fast autos. They are all in the flowering stage. All with natural light in small 3L pots.

Please could you help me with this one?

It's her second flowering week. Was doing just fine up to about 10 days ago, then the tips started curling down and the overall color paled and faded to a light lime green. There're are also some burn/yellowish stains.

I've been feeding her just like the other three, and I flushed it a few days ago.

I've looked up Na overfeeding but the colour doesn't add up. What could it be?

Many thanks in advance!

Eledin · Jul 16, 2025

What medium are you using? Does it drink less water than the others? You can lift the pots and see if she maybe doesnt want that much water. It could be overwatering.

Eledin · Jul 16, 2025

That soil needs perlite, is it an universal potting mix?

puertoesc25 · Jul 16, 2025

Eledin said:
That soil needs perlite, is it an universal potting mix?

exactly what i was thinking

Flanagan · Jul 16, 2025

Eledin said:
What medium are you using? Does it drink less water than the others? You can lift the pots and see if she maybe doesnt want that much water. It could be overwatering.

Thank you! Medium is seedling soil + generic compost. Feed is Palgron Alga grow/bloom. Same watering schedule as the others really.

Flanagan · Jul 16, 2025

puertoesc25 said:
exactly what i was thinkin

Eledin said:
That soil needs perlite, is it an universal potting mix?

Yes. Seedling soil + generic compost. Same as the others really. Medium, feed, watering schedule and light/environmental conditions have been the same for all plants.

The other three are not huge, will probably yield max 20g each (I don't care much), but they have flowered nicely and never shown any visible signs of bad health.

What do you think it could be?

LoveGrowingIt · Jul 16, 2025

Flanagan said:
I've looked up Na overfeeding but the colour doesn't add up. What could it be?

Do you mean N (nitrogen) instead of Na (sodium)? The downward curling leaf tips indicate nitrogen toxicity (excess). The leaves also look dark green to me, which also indicates N toxicity. Stop feeding nitrogen and water with plain water. During flowering, P (phosphorous) and K (potassium) should be increased to promote bud development, but not yet.

Do you know what caused this damage?

I'm also wondering about that white spot. That could be insect damage.

Flanagan said:
There're are also some burn/yellowish stains.

Do you mean these?

I recall seeing this on the forum, but I'm not quite remembering what caused it. IIRC, something blocked the light, preventing photosynthesis.

Flanagan said:
All with natural light

How are they getting natural light? Are they outside or in a window?

Lastly, I agree about adding perlite for your next grow. I also recommend using fabric pots.

Eledin · Jul 16, 2025

I though about nitrogen toxicity but more than clawing its just the tips going down which makes me think its the soil staying wet for too long instead. Good eye, didnt see that dot.

Eledin · Jul 16, 2025

Flanagan said:
Yes. Seedling soil + generic compost. Same as the others really. Medium, feed, watering schedule and light/environmental conditions have been the same for all plants.

The other three are not huge, will probably yield max 20g each (I don't care much), but they have flowered nicely and never shown any visible signs of bad health.

What do you think it could be?

I think that you need a better soil what seedling mix is that? Plagron seedling mix or supermarket/amazon kinda soil?
I would buy a light mix instead of a seedling mix, seedling mixes might avoid using perlite due to seedlings requiring high humidity but youre suposed to transplant them after a few weeks if youre gonna use a seedling mix. Also buy it from a brand that sells soil for weed. If you wanna keep going with plagron just buy their ligt mix instead of the seedling mix.

Eledin · Jul 16, 2025

I wouldnt discard N toxicity like @LoveGrowingIt said but there's some things I dont see happening. Some affected leaves seem to be more pale instead of drak green and I dont see deformities on the leaves and extreme clawing so if its N toxicity its not too bad yet.

Eledin · Jul 16, 2025

Second week of flowering so youre still using alga grow right? The chart says youre not suposed to change to bloom until the 3rd week and then you wont use grow anymore. Maybe swap to bloom already since it has less nitrogen ratio to be safe. I dont see any sign of nute burn on the tips so it seems to like the PK its recieving.

Eledin · Jul 16, 2025

I dont know what the pale yellow stains are caused by, but I have some ideas. Are you phing your water? What type of water do you use? Bad PH can cause chlorosis which leaves pale yellow stains but the veins of the leaves remain green, which seems to be your case. It can also be caused by blockage of light like @LoveGrowingIt said.

katraiter · Jul 16, 2025

Flanagan said:
Hello all!

I'm new here and to growing cannabis. I do it for fun and I have 4 little, fast autos. They are all in the flowering stage. All with natural light in small 3L pots.

Please could you help me with this one?

It's her second flowering week. Was doing just fine up to about 10 days ago, then the tips started curling down and the overall color paled and faded to a light lime green. There're are also some burn/yellowish stains.

I've been feeding her just like the other three, and I flushed it a few days ago.

I've looked up Na overfeeding but the colour doesn't add up. What could it be?

Many thanks in advance!

I had a glue plant last year I put in a one gallon and at flower the leaves curled like eagle talons .. bad , tried a few things brought inside cooled her off , meh....helped some , but at harvest saw the root ball and , OMG she was a brick .

imgrowing · Jul 16, 2025

i've had the yellow on one side of a leaf and green on the other but can't remember what it's called. it's not a deficiency it's a dna thing or something.
nothing to worry about

Eledin · Jul 16, 2025

imgrowing said:
i've had the yellow on one side of a leaf and green on the other but can't remember what it's called. it's not a deficiency it's a dna thing or something.
nothing to worry about

I think I know what you mean and that usually happens with old or badly stored seeds, and usually happens early not late in flower. Also the patterns look different.
I had that paleness a lot of times I planted old bulk seeds, but it doesnt look like this one. I dont remember if it has a name either, I call it "albinism" because its not albinism but I dont have a better word.

Flanagan · Jul 17, 2025

katraiter said:
I had a glue plant last year I put in a one gallon and at flower the leaves curled like eagle talons .. bad , tried a few things brought inside cooled her off , meh....helped some , but at harvest saw the root ball and , OMG she was a brick .

Hahaha wow! Okay so I'll just let it flower with regular watering schedule for the case. Thanks for sharing

Flanagan · Jul 17, 2025

Eledin said:
I dont know what the pale yellow stains are caused by, but I have some ideas. Are you phing your water? What type of water do you use? Bad PH can cause chlorosis which leaves pale yellow stains but the veins of the leaves remain green, which seems to be your case. It can also be caused by blockage of light like @LoveGrowingIt said.

I haven't tested the PH, don't have the tools. May buy it tho. But yeah I suspect it has to do with that too. I've been watering with bottled water (and nutes). Recently I flushed with filtered tap water. Thank you!

Flanagan · Jul 17, 2025

LoveGrowingIt said:
Do you mean N (nitrogen) instead of Na (sodium)? The downward curling leaf tips indicate nitrogen toxicity (excess). The leaves also look dark green to me, which also indicates N toxicity. Stop feeding nitrogen and water with plain water. During flowering, P (phosphorous) and K (potassium) should be increased to promote bud development, but not yet.

Do you know what caused this damage?
View attachment 2477105
I'm also wondering about that white spot. That could be insect damage.

Do you mean these?
View attachment 2477106
I recall seeing this on the forum, but I'm not quite remembering what caused it. IIRC, something blocked the light, preventing photosynthesis.

How are they getting natural light? Are they outside or in a window?

Lastly, I agree about adding perlite for your next grow. I also recommend using fabric pots.

Thank you! Light is from my backyard, as much sun as possible given I'm in a terraced house. Yes sorry I meant Nitrogen. The colour is actually paler than this, I promise. My phone doesn't portrait the colours faithfully. As for roota rot, I doubt it as I've been following a regular schedule watering from the bottom and only when nearly dry conditions were reached. Following the advice that less is more.

For now it's still flowering, although I suspect won't yield as much as initially could.

Thanks!

Flanagan · Jul 17, 2025

Eledin said:
I think that you need a better soil what seedling mix is that? Plagron seedling mix or supermarket/amazon kinda soil?
I would buy a light mix instead of a seedling mix, seedling mixes might avoid using perlite due to seedlings requiring high humidity but youre suposed to transplant them after a few weeks if youre gonna use a seedling mix. Also buy it from a brand that sells soil for weed. If you wanna keep going with plagron just buy their ligt mix instead of the seedling mix.

Seedling mix is from a dedicated garden shop. Can't recall the brand, but it's proper stuff. Okay thanks for your advise, I will use more specific brand next year :)

Eledin · Jul 17, 2025

Flanagan said:
I haven't tested the PH, don't have the tools. May buy it tho. But yeah I suspect it has to do with that too. I've been watering with bottled water (and nutes). Recently I flushed with filtered tap water. Thank you!

Very important yes, maybe your PH is in the okay range but it might be not, specially considering youre not using microorganisms so you need a ph of 6,2 for veg and 6,5 for flower. You can keep it close to 6,5 all grow if you cant be that precise.

Please help :) Flowering Auto showing problematic symptoms

Please help :) Flowering Auto showing problematic symptoms

Flanagan

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