Hi! I have a veg tent that has 5 autoflower plants and 1 photoperiod. I noticed yesterday that on two of my plants the fan leaves are developing some yellowness. Here is pictures for reference.
Been feeding Canna Coco A+B, Rhizotonic, cannazym, and a little bit of calmag agent. 5.5-5.7 pH and 1.3 +-1 EC. This is my first time using calmag agent and my waters EC here is 0.3 so im wondering am i damaging the plants with added calmag?
Macky January 8, 2023 12:45 pm
@sausag Reduce the amount of rhizo your giving them mate, and cannazym. You only really need to be giving them the A & B at this stage really. Some cal mag maybe but not too much, the a & b does have some calcium in them so they should be fine on small amounts in that right now. Just A n B, ph 5.8, ec around 1.
When you're giving the rhizo and cannazym, its taking up room in the EC that could be made up with A & B instead. So though it may seem like you're feeding them enough, you're not, the EC is made up of stuff they won't be using much of. So just go for A & B for a week or so and they will look much better imo.
You getting run off with every feed and draining the runoff away too right? Temp ok?
SausaG Topic starter
January 8, 2023 12:48 pm
I feed till runoff 3 times a week, temps and humidity 22-24c and 60-65%. Ill try with just the a+b for now and see where they get to.
I feed till runoff 3 times a week
That’s not typically how coco should be run. Once the plants are past the seedling stage, you should fertigate every day. When coco is set up properly, you cannot over water it and the daily runoff helps remove unwanted compounds from the media. I’d recommend you follow Macky’s advice and start watering daily with about 20% runoff. The magic of coco is you can usually push the plants faster and larger than in soil because you keep everything the plant might need in the media.
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SausaG Topic starter
January 8, 2023 2:10 pm
@monkeydo This is something I was curious about because when I was studying up on coco growing (this is my second grow in coco). I saw ofc mostly people who grew with this style of 20% runoff at every fertigation. But then I also found people who swore by only doing it once a week. But after thinking about the science of it, it really does seem smart to do it everyday. Now the only reason I wasn’t doing it now is because I didn’t have a good means of suspending my pots above trays. But that issue has been fixed today (you can follow up on this in my current grow diary after this comment). So I will now move to follow 20% runoff daily! A quick question about that, is there a perfered way to get to the 20% runoff without overdoing it? Some division/percentage of the size of pot im using? Thanks for the help! Very much appreciated💪🏻
monkeydo January 8, 2023 3:04 pm
There are a lot of factors involved in how much your plants drink each day so I can’t simply give you a number. Trial and error are my process. If I notice too much runoff, next time I use less and if too little, next time a little more. You don’t need to be precise here. You’re just washing out unused salts and unwanted root created waste from the coco. If you do it a little each day you don’t get a buildup. To show you how non-precise this is, Macky uses 10% runoff as his guide, I prefer 20%. Both work, I’m just more comfortable with 20% so that’s what I do.
looks to me like classic Nitrogen deficiency. I think your plants are hungry and are running out of N.
Hey Sparky, so to pull you up on this mate but this wont be nitrogen def. Nitrogen is a mobile nutrients so it can be moved around the plant to where it is needed most. Usually id there is a def in nitrogen the plant takes it from the bottom leaves and moves it ot where its needed so the lower leaves of the plant will go yellow before anything else does. This can be the same for potassium and phosphorus so those are easy to distinguish.
With them being on the top leaves it is more likely to be calcium/magnesium, maybe even zinc. And these are usually caused by a pH imbalance rather than a deficiency 
A ph imbalance can be caused by not watering enough with what's known as an EC spike. So because you are not watering everyday, the EC can spike and alter the pH which causes problem to the plant, like you're seeing here. Just giving the plant a n b, and watering every day at 5.8 should fix the issue IMO, that should have enough calcium in and micro nuits to feed the plant happily.
Monitor the EC going in, and the EC going out to see what's going on in the medium and find balance and youre good to go, we will explain all this in the show later i think
Sorry for the long post lol
"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”
― Mark Twain
@SausaG, Macky knows WAY more than I do about growing in coco, but I do know that there are many experienced growers that fertigate with an EC of 1.0 - 1.5 every time they water. What you have looks to me like classic Nitrogen deficiency. I think your plants are hungry and are running out of N.
PS: Looks like Monkey beat me to it
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Hold Infinity in the palm of your hand, And Eternity in an hour.
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SausaG Topic starter
January 8, 2023 2:13 pm
@im_sparky This is something I was also thinking about, but right now it seems I have been underfeeding these girls a bit, and possibly with too little base nutrients because of the extra stuff I had filling my EC. So for now ill be following the instructions above with the full 1.0 EC worth of A+B and fertigating daily till runoff👍🏻
I have been underfeeding these girls a bit, and possibly with too little base nutrients because of the extra stuff I had filling my EC. So for now ill be following the instructions above with the full 1.0 EC worth of A+B and fertigating daily till runoff👍🏻
Yes mate, this is the plan water every day too Follow the EC and everything will be fine in a week.
"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”
― Mark Twain
Have you tried a Epsom foilar feed. the interveinal Chlorosis looks like a magnesium deficiency. I see that you have changed the feed as suggested and the new growth is looking good.
Sativa to change the things I can, Indica to accept the things I can’t.
SausaG Topic starter
January 12, 2023 2:26 pm
@twisted1 Man just seems this Banana Frosting doesnt want to grow. Yesterday I aqquired some epsom salt and did the first spray with it. Gonna keep going daily and hope shes finds here way back the light side👋🏻
Worst case ill have to pull her and put my other photoperiod in this pot. A friend should be taking her next week but ill keep her if this baby doesnt get her ball rolling.
I'm no help barely smart enough to grow in dirt 😆 I would love to try coco...mine kinda looked like this until I backed off the light intensity probably just coincidence though
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