Leaves clawing, rust spots, necrosis in coco

[SuperHemp]

Okay this is my 2nd run with coco.. had no problems like this last time

I feed once a day at lights on (running 20/4), 1.5ml canna coco A&B per litre @ ph 5.8-6.2, with runoff. 400W hps.

All the plants from this strain look like this (GDPxLarry OG). I have some blueberry crosses which also have slight clawing but look somewhat better. Then i have a bunch of c99s which look really healthy.

Is it overfert? Or overwater? This problem started in a smaller pot where they had filled the whole thing with roots and they got kinda dry between waterings. I've potted up.

Since i assumed the problem was too much nutes i watered them with plain ph'd water two days and today I gave them a shot of A&B again this time 1ml/L, but they have not improved at all yet.

They are also very stretchy compared to the other strains which are very compact.

 

[SuperHemp]

Above pic is before the flush, these are today.. different plant i think, but they're all similar.. a group shot of all the problem plants also

 

[DHF]

That`s classic cal/mag deficiency with added probs of overwatering.........but ....could be compounded probs by bein rootbound before the up potting.......

Don`t think you can`t overwater in coco with smaller plants.......They haveta grow legs before you can drown their ass and be ok with regular drenchings......

Mix up some weak cal/mag solution and foliar em frequently while lettin the rootzones dry out since yas already flushed em ....Let em grow somelegs/roots.......Runoff ppm`s will letchas know if the plants are eatin or not.....

If they`re lower than your feed , then plants are assimilating nutrients , if they`re higher ......ph will soon get outta whack and ppm`s will soar through the roof and first shows up as cal/mag def like you`re seein.....

Ran coco for several yrs and lettin the upper air root part of the medium dry some works best once the plants are established IME......

Good luck......DHF..............

 

[SuperHemp]

Is the leaf clawing a sign of MG or Calcium deficiency?
I can see the green veins + yellowing bottom leaves on that plant looking like classic magnesium deficiency. I have magnesium and calcium supplements, but not the cal/mag combo, should i give one or both?
Is canna coco A&B known to give cal/mag problems?


The leaves appears to have perked up somewhat over the last hours. I will give them one more day between waterings as you suggested.

FWIW, i've been feeding at 0.9ec, and when i flushed them two days ago, the runoff was 1.1ec, second day flush it had dropped to 0.75ec

 

[Indian Culture]

You need to go out and get yourself some CalMag and don't drench the coco so much right away. Did you rinse your coco before you used it? Is it the same brand of coco you used both times?

 

[SuperHemp]

I need a quicker solution i ordered a bottle of cal-mag but it will be 10-14 days. I'm not in a place where cal-mag is readily available, there's a basic assortment of stuff from Canna, GH, AN and Bio-bizz though. I sprayed them with some homemade cal-mag.

I didn't rinse the coco, all plants have the same brand of coco. I experimented with rinsing but got very bad results on plants in rinsed coco, the coco says it's "throughly rinsed and enriched with essential coco nutrients, just add water" and i think it's true

 

[the gnome]

I need a quicker solution i ordered a bottle of cal-mag but it will be 10-14 days. I'm not in a place where cal-mag is readily available, there's a basic assortment of stuff from Canna, GH, AN and Bio-bizz though. I sprayed them with some homemade cal-mag.

I didn't rinse the coco, all plants have the same brand of coco. I experimented with rinsing but got very bad results on plants in rinsed coco, the coco says it's "throughly rinsed and enriched with essential coco nutrients, just add water" and i think it's true

two weeks is a long time
you can get some epsom salts at any pharmacy or any health sections at walmart, walgreens even grocery stores.
this will provide quick mag for your plants.
blackstrap molasses has around 15% mag in it.

 

[Hold Your Fire]

Yup. Epsom salts!

 

[SuperHemp]

Yes i made a solution of epsom salt and calcium carbonate, spraying at ec 0,7 ph 7. Is this good? The spraying helped the dryness of the leaves. My rh meter shows 40-50% but i think it's not a good reading as it's sitting on top of pots, thus water is evaporating straight below it. Intake air is 35% rh.

Also, my leaves were erecting and straightening out when i went to bed, this morning they are a little droopy again but light is off in two hours i don't know if that has anything to do with it?

 

[DHF]

The clawing and drooping is the overwatering Bro.......Rust spots is the calcium def , and the yellowing interveinal chlorosis is the mag def..........

As they dry out they should perk up , but as they dry out residual salts left in the coco will start to build as well.......

Drooping before lights go off concerns me or did I read that right........they usually droop during lights out and then perk back up after lights on when they`re bigger......

They`re small and needta build some rootmass after bein transplanted....drying periods will help.....Keep up the foliars and once your cal/mag gets there , 5 ml per gal every feed unless you`re using tap water....then at least 3 ml.........

Coco holds onto cal/mag as well as potassium/K and hasta build to a level(be charged) before being released back to the plants for their use......It`s called cation exchange capacity.....CEC.......

Good luck Bro.......DHF...............

 

[Herborizer]

Are you hand watering or using a drip system? You wouldn't have any NGW hoses in there would you? See signature.

 

[SuperHemp]

It's handwatered. The Blueberry hybrids look perky today and will be back to full health shortly I'm sure, however the GDPxOGK are getting worse on the leaf clawing but the stems are still erect and the cal/mag problems are getting worse even though i foliared them with epsom salts and calcium yesterday. The coco is low on moisture but if you guys say i shouldn't water then i wont. They're only in 1 pint pots remember, potted up from 1/2 pint.

 

[DHF]

Some strains crave more cal/mag than others........If they`re only in less than a 16 oz container , they could be rootbound already causin compounded probs.....

Don`t let em dry out completely since they`re in such small containers......I`ve not got a clue how much epsom salts and calcium carbonate would be needed in your feed juice , but yas better give em some rather than none next feed if they`re gettin worse and the foliars ain`t helpin........

Holler if I can help.......DHF............

 

[SuperHemp]

You have been very helpful fixing my blueberries so far And only two of the GDP crosses look really bad now, the others are improving and not looking too bad. I'm gonna try to source some dolomite lime tomorrow as it contains Mg and Calcium and is pretty soluble in acidic water.

For my watering tomorrow, would you try to give them a little more nutes, like 1.5ml/L A&B (vs 1ml/L now)? I suspect they wouldn't mind it? I think they can take one more day without watering, if i take coco from the top and sqeeze it a few drops of water comes out.

 

[emerald city]

was there any mention of the medium's PH..Most problems i see are PH related...Of coarse i dont due coco.
my2c E.C

 

[dominicangreen]

The clawing and drooping is the overwatering Bro.......Rust spots is the calcium def , and the yellowing interveinal chlorosis is the mag def..........

As they dry out they should perk up , but as they dry out residual salts left in the coco will start to build as well.......

Drooping before lights go off concerns me or did I read that right........they usually droop during lights out and then perk back up after lights on when they`re bigger......

They`re small and needta build some rootmass after bein transplanted....drying periods will help.....Keep up the foliars and once your cal/mag gets there , 5 ml per gal every feed unless you`re using tap water....then at least 3 ml.........

Coco holds onto cal/mag as well as potassium/K and hasta build to a level(be charged) before being released back to the plants for their use......It`s called cation exchange capacity.....CEC.......

Good luck Bro.......DHF...............

agree its over watering for sure good eyes DHF

 

[dominicangreen]

dont add any nutes or water just like it completely dry and you'll see color come back and leaves will straighten like it never happen

 

[SuperHemp]

was there any mention of the medium's PH..Most problems i see are PH related...Of coarse i dont due coco.
my2c E.C

I haven't checked the ph of the coco itself but i water at ph 5.8-6.2 90% of the time i hit ph 6.0. The runoff in all pots is always ph 6.0. I can sample the medium and check by infusing the coco in distilled water, and get a proper reading if somebody else thinks it has something to do with ph.

dont add any nutes or water just like it completely dry and you'll see color come back and leaves will straighten like it never happen

okay man, i think they're gonna be pretty dry tomorrow. I had to splash some water in my smallest c99 which is same size as problem plants and in same size pot as she was dry and started to wilt, but she has a bigger rootball than the problem plants though and looks like she should be given more space in a few days. I gave just enough to make her weigh the same as the others.

A shot of the problem plants today and a group shot of all of them. They all have very light tops. More nutes for c99's? They're in the red bin. The lone c99 in the tray looks good all around though.





Thanks for all the help, it looks like they will pull through and come out strong with your suggestions.

 

[Hash Zeppelin]

I agree with DHF. Gnome, and DG

that is pretty solid advice from all those guys.

also check ph to be sure.

 

[SuperHemp]

I personally think the problems started with salt buildup in pots that were too small, i could see the salt residue inside the old pots. I had no discoloration on bottom leaves in early stage, they were just very dark green all around with clawing and necrosis starting from leaf tip on bottom leaves.
And then it got worse developing cal/mag deficiency and i overwatered after putting them in a bigger container. I've just read that overwatering can inhibit calcium uptake and a lot of other things, the leaf spotting and yellowing started after i potted up.

It's great to have all you experienced guys agreeing in my thread, it makes it a no-brainer to follow your advice. I'm adding as much rep+ as i can