Help one of my plants is sick

B

BeginnerBud2

Well-Known Member
Under 400watt mh
Coco perlite
28lt air pots
Green planet nutrients following chart

I don't use a ph pen or cal mag. Others are perfect, 1 is sick and slowly getting worse.

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Nope its not the fan. Not familiar with your nutes but check your product labels - most nutes are 2 part NPK solutions without having the calcium or magnesium that is needed by weed plants. Coco is a drain to waste hydro growing format, coco is not the same as soil. I would start with the ph pen and cal-mag too both are needed to grow in coco unless you find those nutes already have the cal-mag components added. Every grower needs to have cal-mag on hand anyway and ph pen too these are pretty essential unless you are growing in a well buffered soil or living organic soil
 
soil guy here so let’s get more hydro people in here to correct anything I may say that isn’t kosher but think it’s 5.8 for coco. Mix your cal mag first and stir in, then mix your nutes and stir in, wait 10 minutes stir again and then set ph....

also most feed to 10% runoff this flushes out old nutes and delivers fresh nutes, don’t let coco go dry either - again this coco is way different than soil. I’m going to ask @Rexer to weigh In on mixing up your soup
 
Its definitely a deficiency, my guess would be magnesium, when ever using coco try and always use a cal/mag another good product if your not using it is silica, it helps strengthen the plant, keeps your nodes noses close, helps with transportation and uptaking of nutrients and defending against bugs and stress. See if you can also get a rhyzo of some sort that will boost root growth and strength.
 
013 said:
Also I believe your watering habits need help. Since that’s coco you’ve got to water the whole container otherwise parts of the coco will turn hydrophobic and resist water. I’m going to shout at @Justin Goody for an quick check on that
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I actually use ProMix potting mix, and perlite. There is a little bit of coco in there, but I've never done full coco grows. I'd call in a pro like @bluter for this.
 
how often are you feeding ? you're essentially a coco grow which is generally fed daily at least, and multiple times per day in flower. running full sched if you are on top of the feeding may be a bit hot, but i am not seeing signs of an issue with it.

the curl can be ph, heat stress, wind stress, a combination of the above. get the fan away from it and see if it changes things. you should be using a calmag with that media and nutrient line. are you on tap water ? the added stuff in the tap might be saving you.
 
bluter said:
how often are you feeding ? you're essentially a coco grow which is generally fed daily at least, and multiple times per day in flower. running full sched if you are on top of the feeding may be a bit hot, but i am not seeing signs of an issue with it.

the curl can be ph, heat stress, wind stress, a combination of the above. get the fan away from it and see if it changes things. you should be using a calmag with that media and nutrient line. are you on tap water ? the added stuff in the tap might be saving you.
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Hello, I am feeding when the top starts to dry, I have moved the plant away from fan and also got some cal mag so hopefully I notice some positive signs soon. I do use tap water :)
 
BeginnerBud2 said:
Hello, I am feeding when the top starts to dry, I have moved the plant away from fan and also got some cal mag so hopefully I notice some positive signs soon. I do use tap water :)
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cool. you should find out what is in that tap.
coco is a hydro app. they generally work best with a blank slate. a very low ppm water source or RO is often best.

i'm in hempy which is similar.

water/feed to 10% runoff every time you water. coco is either daily, to multiple times a day when in flower. bottle feed schedules are adjusted down to compensate for the multiple feedings. most feed at about 1/2 the bottle chart, some a touch less.

things mostly look good. you are doing well. :)
 
013 said:
My bad - I thought it was quarter strength for coco.... but if I read correctly Bluter said 1/2 the bottle chart or some use a little less
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it depends on the nute line. also some strains are a bit more sensitive to nutrient levels. 1/2 strength is generally a good place to start. adjust up or down depending on how the plants react.

with hydro it's best to track ec / ppm for a few grows until you are comfortable with the nute line you chose. adjust your feed levels to a correct ec/ppm for the stage the plant is at.
 
BeginnerBud2 said:
Do I use half strength nutes for multiple waterings? My tent got to 32 degrees today I'm wondering if that's what's hurting them a bit?
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32 is hot. you need to move more air. and there is probably a lot of moisture in the air when it gets up there. it sounds like you need to be exhausting air outside of the grow space. venting to outdoor is recommended if you haven't. depending on your conditions it may simply be a requirement.
 
build a sig and put a link to your journal so folk can find it.
 

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