Yellow Seedlings in Coco Noir

[GreenBean28]

I have seedlings in Coco that are doing terrible and seedlings in soil premix (from a professional) that are doing great. I had success with my first grow using the premix soil, but this time I decided to try coco...adding my own nutes...and it's not going well. All are in the same 4x4 tent using Spider Farmer lights. My environment (regarding temperature and humidity) should be spot on.

I am using 420flow nutrients and follow the dosage as per the instructions. Maybe this brand of nutes is crap, but the reviews are good.

I only started using the Nutes at 5 weeks (yes, the seedlings look 2 weeks old and are seriously stunted) at about 50% strength. They seem to be doing nothing.

What do you think?

 

[Bdubs]

Nutrient burn. Lockout. Nutrients are too strong, whatever you are feeding her. I like how you have a side by side. But even the promos girl is over fed. Back the nutes down. Give water only to coco a couple times then go back to nutrients and make it less potent.

Dark green, glossy, aqua blue hue is nitrogen toxicity progression respectively.

 

[Bdubs]

They both could use a restart tbh. I see the leaf on the left girl, in the back, she is also yellowing. The tips of the leafs are showing first Pinch of burn.

 

[Beachbumm]

I have seedlings in Coco that are doing terrible and seedlings in soil premix (from a professional) that are doing great. I had success with my first grow using the premix soil, but this time I decided to try coco...adding my own nutes...and it's not going well. All are in the same 4x4 tent using Spider Farmer lights. My environment (regarding temperature and humidity) should be spot on.

I am using 420flow nutrients and follow the dosage as per the instructions. Maybe this brand of nutes is crap, but the reviews are good.

I only started using the Nutes at 5 weeks (yes, the seedlings look 2 weeks old and are seriously stunted) at about 50% strength. They seem to be doing nothing.

What do you think?

View attachment 2242606

View attachment 2242607

How often are you watering the coco plant?

 

[ArtfulCodger]

Coco is inert...there's no nutrition in it. Once your plants have true leaves, they need food. My guess is that you waited too long to feed, and then fed too much. I feed about 400 ppms (.8 EC) in seedling.

 

[TheCroppeteer]

Coco is inert...there's no nutrition in it. Once your plants have true leaves, they need food. My guess is that you waited too long to feed, and then fed too much. I feed about 400 ppms (.8 EC) in seedling.

What exactly does Coco offer then to benefit a medium? Why that instead of soil which includes the food?

 

[ArtfulCodger]

What exactly does Coco offer then to benefit a medium? Why that instead of soil which includes the food?

To my thinking, coco has two main benefits. The first is simply control. It has no nutes in it, so the grower controls exactly what goes in. Amended soils can vary widely, even from bag to bag of the same product. The second benefit is coco's water retention characteristics. Many amended mixes (Happy Frog and Ocean Forest are examples, but there are plenty of others) can hold a lot of water for a long time...making it easy to over-water, which is the situation where roots aren't getting enough air for enough time.

When I start seeds in coco, I give only water until I see true leaves. Usually a week to 10 days from drop. Then I start 400 ppms of a balanced nute mix.

 

[LoveGrowingIt]

What exactly does Coco offer then to benefit a medium?

Good question. My thinking is that an inert medium simply provides an anchor and habitat for the plant's roots. Otherwise, it isn't much different from hydro.

Why that instead of soil which includes the food?

My guess is coir or hydro probably provide greater opportunities for optimizing yield and potency, while requiring greater grower skill. So far, I've only used organic soil growing methods for its simplicity, but occasionally I've considered coir or hydro. I'm still working to improve what I do, though.

Amended soils can vary widely, even from bag to bag of the same product.

Yes. That can be a problem. They can contain pests as well, like fungus gnats, for example. That's why I've been developing my own soil mix. I began with Fox Farm soils, but now, after several years of amending and composting, they aren't much like the original. (I still have plenty of FFOF, though, which I mix in occasionally just to use it up.)

 

[TheCroppeteer]

To my thinking, coco has two main benefits. The first is simply control. It has no nutes in it, so the grower controls exactly what goes in. Amended soils can vary widely, even from bag to bag of the same product. The second benefit is coco's water retention characteristics. Many amended mixes (Happy Frog and Ocean Forest are examples, but there are plenty of others) can hold a lot of water for a long time...making it easy to over-water, which is the situation where roots aren't getting enough air for enough time.

When I start seeds in coco, I give only water until I see true leaves. Usually a week to 10 days from drop. Then I start 400 ppms of a balanced nute mix.

Good question. My thinking is that an inert medium simply provides an anchor and habitat for the plant's roots. Otherwise, it isn't much different from hydro.


My guess is coir or hydro probably provide greater opportunities for optimizing yield and potency, while requiring greater grower skill. So far, I've only used organic soil growing methods for its simplicity, but occasionally I've considered coir or hydro. I'm still working to improve what I do, though.


Yes. That can be a problem. They can contain pests as well, like fungus gnats, for example. That's why I've been developing my own soil mix. I began with Fox Farm soils, but now, after several years of amending and composting, they aren't much like the original. (I still have plenty of FFOF, though, which I mix in occasionally just to use it up.)

Ok, I got it. Thanks. I do understand what you guys are saying and it makes sense. Similar to how with cooking, the more isolate the components/ingredients are at the beginning, the more you can control how the final thing comes out.

 

[GreenBean28]

Nutrient burn. Lockout. Nutrients are too strong, whatever you are feeding her. I like how you have a side by side. But even the promos girl is over fed. Back the nutes down. Give water only to coco a couple times then go back to nutrients and make it less potent.

Dark green, glossy, aqua blue hue is nitrogen toxicity progression respectively.

I never fed her at all until she turned yellow. I normally wouldn't have fed her for another few weeks, but after she turned yellow I gave it a shot...nothing changed. The other one did get burned a bit in the beginning because I accidentally fed her, forgetting that she was in nutrient soil.

Thanks for the response.

 

[GreenBean28]

They both could use a restart tbh. I see the leaf on the left girl, in the back, she is also yellowing. The tips of the leafs are showing first Pinch of burn.

Yea. The better plant did get a touch of burn in the beginning because I had forgotten that she was in nutrient soil. I have 4 in the nutrient soil and 4 in coco. Thanks for the response.

 

[GreenBean28]

How often are you watering the coco plant?

Definitely not over-watering her. The coco drains and dries quickly, so I usually give her some water every other day, or as soon as I can feel that the weight of the water is gone.

 

[GreenBean28]

Coco is inert...there's no nutrition in it. Once your plants have true leaves, they need food. My guess is that you waited too long to feed, and then fed too much. I feed about 400 ppms (.8 EC) in seedling.

I put 4 in nutrient soil and 4 in coco because I wanted to experiment with the coco and my own nutrients. They were yellow from day 1. I waited 4-5 weeks before feeding her, then only used somewhere between 1/4 and 1/2 of the recommended seedling dosage which was about 1 ml per gallon. I didn't check the PPM only because I mixed it so weakly. Regardless, the plant color didn't change at all after a week or so of feeding every 2-3 days.

 

[GreenBean28]

What exactly does Coco offer then to benefit a medium? Why that instead of soil which includes the food?

It was an experiment. I know that my nutrient soil works well, so I put 4 in the nutrient soil and 4 in coco so that I could use my own nutes to see what would happen. They were yellow from the start, then I fed them a very low dosage at about 5 weeks and there was no change at all.

 

[GreenBean28]

To my thinking, coco has two main benefits. The first is simply control. It has no nutes in it, so the grower controls exactly what goes in. Amended soils can vary widely, even from bag to bag of the same product. The second benefit is coco's water retention characteristics. Many amended mixes (Happy Frog and Ocean Forest are examples, but there are plenty of others) can hold a lot of water for a long time...making it easy to over-water, which is the situation where roots aren't getting enough air for enough time.

When I start seeds in coco, I give only water until I see true leaves. Usually a week to 10 days from drop. Then I start 400 ppms of a balanced nute mix.

Thanks for the response. I only put a few seeds in coco so that I could control the nutrition, as it has none in it. They were yellow from the start. I waited for several weeks, then gave them a really low dosage...probably less than 400ppm

 

[ArtfulCodger]

I put 4 in nutrient soil and 4 in coco because I wanted to experiment with the coco and my own nutrients. They were yellow from day 1. I waited 4-5 weeks before feeding her, then only used somewhere between 1/4 and 1/2 of the recommended seedling dosage which was about 1 ml per gallon. I didn't check the PPM only because I mixed it so weakly. Regardless, the plant color didn't change at all after a week or so of feeding every 2-3 days.

The quality of the coco can have an impact as well. Unbuffered coco gobbles up calcium and magnesium...magnesium is the central atom in every chlorophyll molecule, so if there isn't adequate Mg, plants will have a hard time photosynthesizing.

 

[Beachbumm]

https://www.thcfarmer.com/threads/growing-cannabis-in-coconut-coir-with-hydroponic-nutrients.162154/north

Definitely not over-watering her. The coco drains and dries quickly, so I usually give her some water every other day, or as soon as I can feel that the weight of the water is gone.

Just what I thought, you're watering the coco wrong.

You have to feed it multiple times per day, never letting it dry out

Growing Cannabis in Coconut Coir with Hydroponic Nutrients

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