Yellowing on 2 week old seedlings - Just overwatering?

[Hazelnuts]

You can't see it too well because theyre under a hps, but the leaves, not only the seed leaves, are pretty yellow on some of my seedlings. What could be the cause of this?
BTW theyre in jiffy pots as you can prolly see

Thanks in advance
HN

 

[MoeBudz^420]

Hey, they don't look too bad ATM, but at the very least I would get those larger ones potted into some 16-20 oz cups, or 4-6" pots w/ a seed starter (unferted) potting soil, as there is not much nutrients or room for roots to grow in a peat puck. I am not a sick plant guru, but I do see a rootspace issue...

Once a root comes out of a peat puck, it is exposed to air and can die by drying out...if yellowing continues to progress after a transplant, a light feed could be in order, but I'd wait and see before feeding. Seedlings are very easy to nuke (overfeed)

Plants needs rootspace...Watch the new growth, damaged leaves tend to stay that way. When watering, go by weight - a watered container is way heavier than one that's dry and needs watering.

Here's mine, they are approx. 3.5 weeks from seed in the pic, under 240W of CFL. N/M the yellow bottom leaves, they happened before transplant, as they were real rootbound in the red beer cups @ approx. 2.5-3 weeks from seed.

Peace

 

[Hazelnuts]

OK, I think you're right. I'll transplant them tonight. Thanks a lot.

 

[MoeBudz^420]

You're most welcome. Be sure to punch drainage holes in the bottom if you use cups.

Peace

 

[MynameStitch]

Dude; I will tell you why they are yellowing; for one; do not use the HPS; improper spectrum; you will get a whole new gear if you use the proper sprectrum of lighting.

Another thing; by the size of that plant there is supposed to be roots hanging out of those pucks; the roots died from the air and not keeping moist enough; those plants were supposed to be put into cups long time ago; some are too big for them and the seedlings that are stretchy and lanky; this is do to the improper spectrum. Another problem; pucks can only supply so much nutes after the plants have used there stored nutes from there cotyledons; after this the plants have to be put into pots or be fed; I would not feed them right now; if the mixture you put them in; make sure it's not too overly strong; and wait a bit at least a week or 2 before feeding. When you do; make sure you don't listen to the directions on the bottle unless cannabis specfic nutes otherwise you will burn them.


Get some compact fluros blue spectrum; you can keep them closer and it will reduce the stretching a lot.

When seedlings tap root shows at the bottom it normally comes out about an inch and stops and then it grows side shoots when you see those side shoots come out you want to make sure you get them into cups; roots dry out and once they do they die and fall off..........

The only way you can keep them alive somewhat with the situation you are in is if they were kept in a dome and by then you don't want them in a dome at the size they are; the ones that are bigger that is, not talking about the smaller ones with 2 leaves or first sets of leaves.....

Get them into some pots; the smaller ones can go into cups soon and get some compact fluros and your problems will be solved.


I used peat pucks all the time for seedlings and clones and know them well; made a grow thread about cloning long time ago.

As for the HPS, I would use that when the plants get bigger and prefably when they flower.

 

[Hazelnuts]

Dude; I will tell you why they are yellowing; for one; do not use the HPS; improper spectrum; you will get a whole new gear if you use the proper sprectrum of lighting.

Another thing; by the size of that plant there is supposed to be roots hanging out of those pucks; the roots died from the air and not keeping moist enough; those plants were supposed to be put into cups long time ago; some are too big for them and the seedlings that are stretchy and lanky; this is do to the improper spectrum. Another problem; pucks can only supply so much nutes after the plants have used there stored nutes from there cotyledons; after this the plants have to be put into pots or be fed; I would not feed them right now; if the mixture you put them in; make sure it's not too overly strong; and wait a bit at least a week or 2 before feeding. When you do; make sure you don't listen to the directions on the bottle unless cannabis specfic nutes otherwise you will burn them.


Get some compact fluros blue spectrum; you can keep them closer and it will reduce the stretching a lot.

When seedlings tap root shows at the bottom it normally comes out about an inch and stops and then it grows side shoots when you see those side shoots come out you want to make sure you get them into cups; roots dry out and once they do they die and fall off..........

The only way you can keep them alive somewhat with the situation you are in is if they were kept in a dome and by then you don't want them in a dome at the size they are; the ones that are bigger that is, not talking about the smaller ones with 2 leaves or first sets of leaves.....

Get them into some pots; the smaller ones can go into cups soon and get some compact fluros and your problems will be solved.


I used peat pucks all the time for seedlings and clones and know them well; made a grow thread about cloning long time ago.

As for the HPS, I would use that when the plants get bigger and prefably when they flower.

Thanks for the advice. I know a HPS isn't optimal for veg phase, but I don't have an alternative atm, and the bulb has a mixed spectrum. I transplanted them yesterday, I hope they get better.

 

[MynameStitch]

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