Please help, Major problems

Hey all,

Im hoping for some advice here, today these plants will be bang on 4 weeks old to the day. They are usually in there final 11ltr pots by now but the growth has been so slow they are still in the middle pot

Currently In 2 litre pots, pure coco, drain to waste on 0.9 EC and a varied PH between 5.7 - 6.0 with cal mag, growers ark root tonic and silicon budlink - a healthy distance from the 600w dual spectrum hps 18/6 in veg.

I have 3 critical cheese by dinafem and 5 gelato 41 by flavour chasers

This is my 4th grow so have had successes and every grow even my first has been 0.8gpw or higher but never got closer than 0.93gpw

This is really fustrating me, the only difference between this grow and all my 3 previous is the fact im using root tonic by growers ark as opposed to Ferro Root Stimulant. Everything else light lighting, tent, temps, ph, ec, nutrient selection is exactly the same.

It looks like either cal mag or zinc deficiency but I dont know how this has happened - there not drinking properly either - usually at this stage i water everyday but i am not at the moment as they would just get over watered.

Please help anyone

Thanks.....

No one has any idea either ?

This is really annoying I can't figure this out

Did you pre wash the cocco? Are you feeding them? What are you using to measure ph?

These threads are always tough to diagnose, pics aren't a replacement for physically being present with the plants.

100% cocco isn't my game, hopefully someone will chime in

I am not familiar with what you are feeding them but they look burnt to me. I would try flushing them with some ph’d water and just giving them that for a week or two.

They are probably in a lockout situation so the flush should help them get back on track.

What PPM is your nut mix?

LuK2007 said:

No one has any idea either ?

This is really annoying I can't figure this out

Click to expand...

You might want to post a thread in the plant problem section.
https://www.rollitup.org/f/marijuana-plant-problems.65/

I'm not sure where the problem begins and ends, but I can say that there is definitely some nutrient lock-out happening there...those very top, newest leaves remind me of what it looks like when you get trace and macro nutes locked out...have you tried cutting back on your feed?...When in doubt, cut back your feed....is it possible that you have a root rot type problem? I've never used coco, so idk how prevalent these kind of root problems are.

Magnesium deficiency, lower leaves yellow and inter venal yellowing. Your PH is pretty low for Mg absorption, "magnesium specifically tends to be best absorbed above 6.0"

https://www.growweedeasy.com/magnesium-deficiency-cannabis

Have you been taking good care of your PH pen?
Keeping it in it's solution?
Make sure your PH meter is properly calibrated.
Never hurts to have the drops as a backup.
Not the ones for the pool, the ones from the hydro store that have a wider test range.

Plus, doesn't coco require a higher PH than hydro anyways?...I know 5.7-6.0 is perfect for DWC, but in coco?...I think it needs to be higher, but idk as I'm not all that well experienced with coco.

i us

Kushash said:

Have you been taking good care of your PH pen?
Keeping it in it's solution?
Make sure your PH meter is properly calibrated.
Never hurts to have the drops as a backup.
Not the ones for the pool, the ones from the hydro store that have a wider test range.

Click to expand...

e a ph pen and also my manual ph check with the solution

SmileyBizz said:

i us

e a ph pen and also my manual ph check with the solution

Click to expand...

Not sure what you're trying to say, Smiley?

Ph your water to 6.1 then flush using 3x volume of water for flush. Then mix a batch of nutrients. At that size your safe running 1/4-1/2 strength (to low is better you can add another feeding relitively soon, give your plants time to recover their eating slows with stress.)
What nutrients are you using?
When I ran coco I fed- rehydrated (no excess)-flushed- fed

Yeah 6.1 or 6.2 works alot better in coco

Personally I’d stop giving calmag as it’s not that I’d re pot these into bigger pots and move the light right up over a good 4 foot away and water once with very low feed and trust me they will recover but it won’t be overnight

Thanks to everyone who replied

I simply cut out cal mag and fed just a and b nutrients with no additives and went to 1.0ec and 6.0ph for a week and they bounced back
There huge now
Thanks again

LuK2007 said:

No one has any idea either ?

This is really annoying I can't figure this out

Click to expand...

Got the same problem.

Do as I done mate and see how u go

I believe mine was due to a combination of overwatering with cal mag being too much in the mix building up because the plants weren't drinking properly

Just make new nutrients with just a and b and root stim

Ph 6 and 1.0ec (so long as there 3-4 weeks old like mine were when I posted this)
There doing great now in 11litre pots coco and getting big

Going to flip to 12/12 real soon