2 Week Seedling yellow leaves (Blue dream)

logjam.key

New Member
Hi there

First I read all sorts of plant advice from threads with the same topic: Seedlings with yellow leaves.
Most of the time overwatering seems to be a problem, or too many nutrients in that stage (correct me if I am wrong...). In my case I am pretty sure this is not the reason.

On my images you see one plant with yellow leaves, two other plant which have more or less the exact same growing conditions (just different strains).

Here the facts:
- Growing outdoors on balcony. Definitely a lot of light (8–16/17)
- Sprouted in coir pellets, then replanted in plagron growmix, after root started to come out at the bottom
- Definitely checked the watering, not every day, plant never seemed to droop.
- Because I grow them outdoors the temperature range is quite big on my balcony. It gets pretty hot if the sun is out. (a thermometer lying in the sun gets up over 40 degrees celsius. So I thought that is definitely too much (although the other two plants did not seem to have cared too much). I repositioned them in a spot where there is some wind going and the sun is not heating up the stone slabs underneath. Temperature during the day is probably around 15-25 ° celsius. At night, I always check, it does not go below 0°, it stays around 8°. The strain with the yellow leaves also should be able to handle colder temperature.
- All three plants seem to have a solid growth and don't look sick otherwise.
- the plant with the yellow leaves is a Blue Dream strain

So I really would like to hear your opinion:
- Why would the one plant be so different from the others
- Do you think it is rather a temperature thing (which I started to improve a week ago, but the plant still produces yellow leaves) or
- could it be due to too many nutrients (the growing medium (growmix by Plagron) is prefertilized for three weeks. The plant spent the first 5-7 days in the coir pellet only...
- Or is it a completely other reason, you could think of?

Thank you all for your advice.
cheers

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logjam.key

New Member
Hm, as I said I have a prefertilized grow medium (3 weeks) and the plant is still quite small. Do you really think it's that. It would be super hungry then :). ate it all up already...
 

logjam.key

New Member
Hm. I bought blue dream, because I read that it is an easy to grow outdoor strain... I thought it should be too picky about conditions...
For the last few days, I put it into half-shade, to keep the temperatures low and to not have it exposed to too much sun directly.
I am tempted to add fertilizer now, but I don't want to rush into that, because getting things out of the soil is a bit more difficult...

What do you think, after how much time the plant should recover from too much sun/heat?

I tried to improve the sun-situation for a week now, I assumed that it should have recovered by now...

BTW: Thanks for your input. Much appreciated!
 

Boatguy

Well-Known Member
Hm. I bought blue dream, because I read that it is an easy to grow outdoor strain... I thought it should be too picky about conditions...
For the last few days, I put it into half-shade, to keep the temperatures low and to not have it exposed to too much sun directly.
I am tempted to add fertilizer now, but I don't want to rush into that, because getting things out of the soil is a bit more difficult...

What do you think, after how much time the plant should recover from too much sun/heat?

I tried to improve the sun-situation for a week now, I assumed that it should have recovered by now...

BTW: Thanks for your input. Much appreciated!
May just be the temps. Low of 8 and high of 15 is pretty cold for growing.
 

logjam.key

New Member
during the day it is warmer now. mostly around 20, in the sun easily warmer. if I don't put it in the shade it can get over 30°. so I assumed it was rather too hot than too cold.

Because I grow them outdoors the temperature range is quite big on my balcony. It gets pretty hot if the sun is out. (a thermometer lying in the sun gets up over 40 degrees celsius.
 

logjam.key

New Member
They got bigger in between, but as you can see the yellow one is still quite yellowish...
Almost everytime I water, I have added fertilizer, but still I have yellow leaves.

It seems to be growing more or less at the same speed as the second smaller plant, which is the same age...

What else could it be?
I am for sure not overwatering and I think its not a fertilizing problem either (although they say blue dream is pretty nitrogen-hungry)...

Thanks for any other idea.
Cheers
 

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logjam.key

New Member
Just normal tap-water.I just checked what the official values are for our tap water and indeed it is a bit high. around 7.8.
What could I use to bring pH down easily? Would ground coffee do the trick to make it more acidic?
 
Just normal tap-water.I just checked what the official values are for our tap water and indeed it is a bit high. around 7.8.
What could I use to bring pH down easily? Would ground coffee do the trick to make it more acidic?
I am a hydro grower I use ph down but I think there are a few organic ways in soil a quick google should find I think dolomite lime lowers and also buffers it but someone else would know more probably Citric acid vinegar etc but that would be more phing the water before it goes in there are a few ways you can lower the soil itself don’t know them off the top of my head but as I said google will know
 

logjam.key

New Member
I did that. I'll get back here, if I can get my yellow plants to be green again.
Thanks for the input. I think this is a promising track to follow down. Much more than nitrogen deficiency!
 
I did that. I'll get back here, if I can get my yellow plants to be green again.
Thanks for the input. I think this is a promising track to follow down. Much more than nitrogen deficiency!
to be fair if you had said your ph was correct I would have assumed it was hungry lol I had a similar problem with yellowing on my plant recently but my ph was opposite dropping low and because of lockdown I couldn't get ph up so iron among other things were getting locked out and it was yellowing up finally got the ph up an now shes greening up nicely. I had to keep her in veg for an extra month looks like a damn tree now
 

logjam.key

New Member
yeah, no worries. I wasn't trying to bash your other hints. Probably would be the first thing to look at, the nitrogen. I think this time it just makes much more sense to me.
And good thing you got your's back to life :).
In my case mother nature defines how long vegetative and flowering stages will last :).
They should have some more time to grow till october :).

Anyway. Thank you. Let's see if I can fix mine as well.
 
yeah, no worries. I wasn't trying to bash your other hints. Probably would be the first thing to look at, the nitrogen. I think this time it just makes much more sense to me.
And good thing you got your's back to life :).
In my case mother nature defines how long vegetative and flowering stages will last :).
They should have some more time to grow till october :).

Anyway. Thank you. Let's see if I can fix mine as well.
I hope so dude best of luck
 
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