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Thread: yellowing leaves in coco please help

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    Default yellowing leaves in coco please help

    hi everyone im a newby to this site so please be nice lol

    my problem is that i am growing 13 plants (i know not a good number to start with) they are all in canna coco. I vegged for 3 weeks under 1 600w duel spec then switched to 12/12 then added another 600w duel spec, i have a big isolating fan and a primaclima climate controller that keeps the room 27 degrees, the room is 1 meter by 2 meters. The plants are in 2 gallon builders buckets with holes drilled in the bottom. Im using the full canna range, canna coco, canna coco A & B, rhizotonic, cannazym, PK13/14 and canna boost.

    i fed the plants once a day with half strength until i noticed leafs going light green then i increased to full strength and always kept the ph at 5.7-6.0. Now im starting to get worried my leaves are going a uniform light green/yellow just under 4 weeks into 12/12 light please help
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    Do you know what your EC is. Yellowing of leaves can be many things including nute burn is it all the leaves or just top ones? As you just upped the nute intake it could be that.

    Somebody who knows better than me will be along to give better advice though as i am only a nube.

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    i started my EC at 1.5ms then when i noticed the light green leaves i upped it to 2.0ms in 3 stages i.e 1.5-1.7-1.8 then finally 2.0 the light green leaves are all over apart from the small ones coming out off the bud these are a nice dark green

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    here is a couple of better pics i messed up the last 1s
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    like i say i am not experienced however 2.0EC is a bit high i was always told for a flowering plant to be 1.6-1.8 and to only push the upper limit with a high power hid light.

    Also yellowing of leaves towards the end of flower is normal i believe as long as the buds look healthy, which they do only have 3-4 weeks left just keep an eye on them and if they get worse then put them in the infirmary but at the minute i think your ok. Just be aware of your EC

    good luck, your gonna have a good harvest

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    thanks for the reply. is 2 600 watts HPS not high power hid lighting? another thing is i thought i was early into flowering they had the lights turned 12/12 about 3 and a half weeks ago so i thought that i probably had 6 weeks left (but im just a novice) im just worried that the crop is gunna die.

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    Looks pretty good except for the nute def. You say that the new leaves are a good colour so it seems you've fixed what was wrong. I also grow in coco and I find the medium very hungry for Ca/Mg. I'd sprinkle a level dessertspoon of slaked lime into each pot and water it in with 1 level tsp of magnesium sulphate per gallon of water.

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    i always thought that the new leaves would be a better color because the nute def would appear first in older leaves i dont think i have fixed the problems because they are still going light green / yellow

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    How about PH levels as like canna says if your defficient of a nute then you shouldn't rule out nute lock out of a particular nute. Yeah your lights are a good strong source so the upper limits are where you should aim i was always told 1.8 max but that was for hydro so it may vary for soil.

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    maybe i am wrong correct me if i am, but i thought coco was hydro with regards to ph i seen a article in the urban gardener that said a fluctuating ph is a good thing so long as you keep it in the "uptake range" this is why i fluctuate between ph 5.7-6.0 is this a good practice or should i keep it constant?

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    my bad getting my threads crossed

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    please someone give me more info ive gone out today and got some epsoms but i dont want to dose if its not mg def. Its getting worse and im getting worried

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    Don't panic, their weeds and will survive... looks like could be one of if not all (3) things. 1) Not enought O2 at roots {just ph balanced 6+\-water that you put a mixer/drill bit to airate the water before adding it, a long straw and blow bubbles in it for 3 hours, lol just kidding} 2) Bad nute burn NO MORE NUTES for a week or two till green up 3) Mg defincency {after you got the water ready above put a 1/2 to 1 full teaspoon of epsom in with it} don't put any more than that. If you see it is greening up in a day or two you know it was Mg. Too much (a handfull or 6+ teaspoons) is poison. All above was figuring about a bucket of water. Don't worry man it's OK be patient.

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    The more I look at it you said you started half nutes/ then yellow and went full nutes and got worse. Bring EC to 1.5 still do the O2 water if not get a new 6" airstone for the bottom of res, still do a little epsom until it gets to 1.5 and should look better.

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    thanks mate i will give it a do see what happens, and ill let you know the outcome in next couple of days

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    I am no expert. But I am using coco and a 600w light. from the look of things they look fine. im sure during flowering the leaves do go yellow as the buds are using the nutes.

    your growing buds not leaves so i'd just leave it you must be close to the chop??

    I'm new to this but thats just what i've learn't so far. hope it helps.

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    nitrogen deficiency add a few extra mls of grow feed

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