HELP! Coco: Deficiency or Nute Burn?!

Hello all!

First - thank you for your time, I'm in desperate need of advice! (pics at the end)

Setup:
315 CMH lights
Cana Coco
Cana Coco line of nutes
Temps: 68-75*F
Photoperiod: 24hours (cold outdoor temps, not enough heating yet during lights off)
Humidity: 50-60% (occasionally drops to ~40% if water in humidifier runs out)
Tap Water PPM: 160

Background:
- Plants started from seed. Germinated well, sprouted well, healthy seedling growth in 2"x2" starter blocks (coco).
- Transfered plants to 6"x6" square pots (too large of a step up I believe).
- Started feeding according to the Cana Coco chart for first 1-3 weeks of growth (image below):

- Week 4/5 I started to step up the nutes towards the next feed bracket. (approx 200ml of water/feed per plant - dried out after ~3days... ppms started around 500, then moved up to 1000, then 1300).
- At this point leaf issues started arising (yellow dots progressing to brown spots/patterns mostly at the CENTER of the leaves... where most forums show nute burn beginning at the tips/edges and moving inward.). I researched and found that it looked similar to calcium deficiency and I wasn't using a Cal/Mag at the time so bought Cali Magic and began supplementing at bottle's recommended level: 1ml/1litre and figured it was a deficiency.
- Believing I had a cal/mag and nutrient deficiency, I began feeding full strength nutrients according to the Cana chart for plants older than 3 weeks (plants were about the same size they are now)
- Plants were growing but leaf issues worsened (drinking faster, having gradually stepped up to 500ml per plant per feed).
- The thought occurred to me that I was overfeeding (so I gave a plain water dose - (no runoff) then a 1/2 strength feed the next time). This didn't seem to resolve anything so I figured that it wasn't over nutrified and went back to the full strength chart schedule (ppm ~1300)
- At this point the plants have stunted growing for a week at least and are progressively getting worse.

Now I'm at a loss and am thinking of doing a 5litre ph'd water flush to clear out any salt buildup that may be there and start with a 1/4 strength feed and work up form there... Thoughts?

MedicalGrow123 said:

Hello all!

First - thank you for your time, I'm in desperate need of advice! (pics at the end)

Setup:
315 CMH lights
Cana Coco
Cana Coco line of nutes
Temps: 68-75*F
Photoperiod: 24hours (cold outdoor temps, not enough heating yet during lights off)
Humidity: 50-60% (occasionally drops to ~40% if water in humidifier runs out)
Tap Water PPM: 160

Background:
- Plants started from seed. Germinated well, sprouted well, healthy seedling growth in 2"x2" starter blocks (coco).
- Transfered plants to 6"x6" square pots (too large of a step up I believe).
- Started feeding according to the Cana Coco chart for first 1-3 weeks of growth (image below):

- Week 4/5 I started to step up the nutes towards the next feed bracket. (approx 200ml of water/feed per plant - dried out after ~3days... ppms started around 500, then moved up to 1000, then 1300).
- At this point leaf issues started arising (yellow dots progressing to brown spots/patterns mostly at the CENTER of the leaves... where most forums show nute burn beginning at the tips/edges and moving inward.). I researched and found that it looked similar to calcium deficiency and I wasn't using a Cal/Mag at the time so bought Cali Magic and began supplementing at bottle's recommended level: 1ml/1litre and figured it was a deficiency.
- Believing I had a cal/mag and nutrient deficiency, I began feeding full strength nutrients according to the Cana chart for plants older than 3 weeks (plants were about the same size they are now)
- Plants were growing but leaf issues worsened (drinking faster, having gradually stepped up to 500ml per plant per feed).
- The thought occurred to me that I was overfeeding (so I gave a plain water dose - (no runoff) then a 1/2 strength feed the next time). This didn't seem to resolve anything so I figured that it wasn't over nutrified and went back to the full strength chart schedule (ppm ~1300)
- At this point the plants have stunted growing for a week at least and are progressively getting worse.

Now I'm at a loss and am thinking of doing a 5litre ph'd water flush to clear out any salt buildup that may be there and start with a 1/4 strength feed and work up form there... Thoughts?

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I use H&G drip clean the whole way through with coco and haven’t had a lock out or salt buildup since I started using it,and I don’t let the coco dry out more than 80% when the coco dries out it leaves a salt buildup and the next time you feed you get a spike in e.c. I’d flush with 1/8th strength p.hed solution and then see how you go and next run try using drip clean from the start.

Does the coco come pre-buffered?
If not, when you try to feed the plant calmag it actually binds to the coco, pushing off the more toxic and unwanted Na and K in high levels that previously held those bonds.

ANC said:

Does the coco come pre-buffered?
If not, when you try to feed the plant calmag it actually binds to the coco, pushing off the more toxic and unwanted Na and K in high levels that previously held those bonds.

Click to expand...

Cana Coco comes pre buffered.

Go put this in Google

"Mick's Coco - K.I.S.S. - Scrog Method"

I would start feeding every day. Coco is not soil. Don't treat it as such. It is hydro. Feeding every day pulls fresh oxygen to the roots. Once I started feeding daily, my plants exploded.

Agree with @TCH I ended up adding perlite so I could water twice daily and definitely noticed a big difference in growth and more importantly overall health

I’m not a fan of Canna products either although a lot of guys get good results with it. These plants are in House and Garden coco fed with H&G’s full line

Thank you all very much for the info! I will do as recommended.

For plants this size when feeding daily should I use canna's recommended feed amounts? (20ml/10L A&B, etc) or should I use a diluted amount?

Thanks!

I use botanicare and start at 1/4 strength and then work up. I'm currently at 46ish days and they appear to be healthy so I'm holding steady at around 3/4 strength or so. I'm not familiar with cana nutes though.

I’d feed them at 1.2 -1.4 E.C

OzCocoLoco said:

Agree with @TCH I ended up adding perlite so I could water twice daily and definitely noticed a big difference in growth and more importantly overall health
View attachment 4035735
I’m not a fan of Canna products either although a lot of guys get good results with it. These plants are in House and Garden coco fed with H&G’s full line
View attachment 4035736

Click to expand...

So you say your running the full line, and have good results if you could only choose only a few of the line above the base nutes what would you pick?

Im in veg now in coco hand watering until flower. I use the base a and b, nitro boost and multizen, i have other lines of stuff for calmag and silica. Wondering about the bud xl?

calcium deficiency bro.

apollo4201982 said:

So you say your running the full line, and have good results if you could only choose only a few of the line above the base nutes what would you pick?

Im in veg now in coco hand watering until flower. I use the base a and b, nitro boost and multizen, i have other lines of stuff for calmag and silica. Wondering about the bud xl?

Click to expand...

Roots excelurator is the best additive I’ve ever used,we don’t have the nitro boost over here the amino treatment has plenty of silica I never use calmag,the bud xl is one I haven’t been able to find much about but I think it’s an enzyme driver. I like to use it the way it’s been designed each product seems to have a job to do and they all work well together.