Please help! What's wrong with my plant ?

[Lovethemota]

Hello,
This is my first indoor grow. I currently have 4 plants (White widow XXL auto, blue kush auto, and 2 OG skunks). I am using a 300W LED galaxy hydro light, under a 18 hr light schedule.
I am growing in coco coir, and am keeping my PH at 6.0
The nutrients I'm using are flora-Grow, flora-Micro, and flora-Bloom accompanied by Cal-mag.

My plants were doing great, until I noticed some leafs were starting to yellow and stems were turning purple.

I've also found some "Salt" on top of my soil. I'm wondering if this has anything to do with it?

Thank you all






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[Demon42069]

Hey, how old and where is the yellowing occuring? Could be the light not strong enough to penetrate to the lower leaves so they are being cannibalized or could be salt buildup creating lockout which a good flush would fix. Never used coco though so someone else might know better.

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[Demon42069]

Oh and if coco is same as normal soil you want ph between 6.2 and 7.0. Not sure how much perlite you added either, could need more air to roots.

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[Lovethemota]

My plants are about 8 weeks old now. The yellowing is happening on the lower leaves and slowly making its way to the top.

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[Demon42069]

What size pots? They look pretty big so may be root bound in 3gal or less after two months. Not sure if a 300w led can penetrate that far down on those so might be only the bottom ones will die of since the plant doesn't need them anymore. Happens to mine if they get too bushy and tall.

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[Demon42069]

After two months a good flush wouldnt hurt anything either. Use 3x pot size of half strength nute water.

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[Lovethemota]

Hmm...The pots are smaller than 3 gallons. Will definitely transplant them tomorrow. Any idea why the stems are purple? Or if this is bad?
Thank you for replying


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[Demon42069]

Ive heard a variety of reasons for that, some say its because they are hungry or lockout is the cause, or its just natural. I would say pot up to at least 5gal and give a good phed 1/2 strength flush, see how it responds. Maybe flush first then transplant. Some side cfl lights are a cheap way to get more light to the bottom too. Just make sure you use the right kelvin rated bulbs.

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[Cannabomb62]

The purple stems is magnesium. Your plants need more mag. And the yellowing looks like it just need more nitrogen. But also may just need mag. Get a calmag supplement or you can give them Epsom salt.

CannaBomb62000000

 

[Cannabomb62]

You need to be feeding 2 to 3 ml of calmag in coco every time you feed. Coco locks out mag. So just get some calmag everything will be good

CannaBomb62000000

 

[Lovethemota]

Thank you both so much! Will definitely be generous with my cal mag from now on.


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[Demon42069]

Just dont go overboard, too much can cause calcium lockout. Ive always read 1tsp per gal water. You can foliar feed with some calmag water for a quick fix too.

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[Lovethemota]

Ok, I'll give that a try


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[Cannabomb62]

For sure no problem keep it at 2.5 ml per gallon. I grow in coco and use that much and never have a problem 5ml is a little to much and can cause cal lockout. Keep it at 2.5 you'll be good

CannaBomb62000000

 

[NuttyProfessor]

Oh and if coco is same as normal soil you want ph between 6.2 and 7.0. Not sure how much perlite you added either, could need more air to roots.

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sorry but coco is the same as hydro 5/6 -5.8 is best , then 6.0 3/4 weeks into flower
flush as said above then feed with grow nutes with a high ( N )

 

[Demon42069]

sorry but coco is the same as hydro 5/6 -5.8 is best , then 6.0 3/4 weeks into flower
flush as said above then feed with grow nutes with a high ( N )

Ah right, i was thinking of a coco soil mix. Haven't learned much about hydro yet, waiting til i can set my own up.

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[NuttyProfessor]

i thought the same when i started we all learn quickly on here though