What deficiency is this?

C

CannaCountry

Well-Known Member
My two cents:

Your pH is way too high for a coco grow. This should be managed at @ 5.8. And if your grow shop tells you, it's not necessary to check your pH because the water in your area is good; find another shop, or certainly research their advice before you follow it.

Your girls look short on Mg (the yellowing between your leaf veins) and Ca (the rust spots). Coco holds onto both of these elements, which means you need to supplement your feed with additional Mg and Ca. Most will do this via a CalMag supplement and if this is all you have; use it. I prefer adding them separately by way of Epson Salt and Calcium Nitrate, but to each their own. Conversely, if you didn't wash your coco before using it, it's possible to experience exactly what you are now.

I would go back and revisit your nutrient line and be sure it contains Mg and Ca. If it doesn't I would add both, and if it does, I would supplement it accordingly. In other words, more is not always best, so research what you're starting with or not, before you just dump something in for the sake of doing something. Once you determine what you think you need in terms of a 'complete' feed, make some up and feed your plants...if you think you have residual salts in your medium, run a bit more of this 'complete' feed, pH'd accordingly of course, through your plants...your coco will take on the characteristics of your new feed, you'll rinse out some of the residual salts and you're back to the races.

Start here; revisit your pH and your feed makeup.

Good luck friend.
 
psydburnz

psydburnz

Member
CannaCountry said:
My two cents:

Your pH is way too high for a coco grow. This should be managed at @ 5.8. And if your grow shop tells you, it's not necessary to check your pH because the water in your area is good; find another shop, or certainly research their advice before you follow it.

Your girls look short on Mg (the yellowing between your leaf veins) and Ca (the rust spots). Coco holds onto both of these elements, which means you need to supplement your feed with additional Mg and Ca. Most will do this via a CalMag supplement and if this is all you have; use it. I prefer adding them separately by way of Epson Salt and Calcium Nitrate, but to each their own. Conversely, if you didn't wash your coco before using it, it's possible to experience exactly what you are now.

I would go back and revisit your nutrient line and be sure it contains Mg and Ca. If it doesn't I would add both, and if it does, I would supplement it accordingly. In other words, more is not always best, so research what you're starting with or not, before you just dump something in for the sake of doing something. Once you determine what you think you need in terms of a 'complete' feed, make some up and feed your plants...if you think you have residual salts in your medium, run a bit more of this 'complete' feed, pH'd accordingly of course, through your plants...your coco will take on the characteristics of your new feed, you'll rinse out some of the residual salts and you're back to the races.

Start here; revisit your pH and your feed makeup.

Good luck friend.
Click to expand...

Thank you so much for the advice and knowledge. :) I shall adapt / start checking these details more acuratly in future.
Never had a problem at all in the past two years, so might have got a bit ‘sloppy’ and just going with ‘what I knew’, if you get my gist.

Thanks again, will report back with more pics and keep the thread updated as I want to nip this one in the ‘bud’ - excuse the shit pun! Haha
 
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