Nutrient excess???

This is a sativa dominant Hawaiian Gold autoflower plant (6 weeks old)that up until today has looked healthy.
It is in coco that I rinsed well several times with ph'd water and buffered twice before planting as a seedling. Each buffer was allowed to stand in calmag water for 8+ hours. (twice) That was about 5 weeks ago.
I have been feeding Canna A/B at about 900ppm. (7ml/gal)
I feed every day until runoff. Once per day as of now.
Temps are in the upper 70's F in this temporary grow area.
Humidity is in the upper 50's.
I have 2 sf4000 led lights in there hung about 18-20" above the taller colas.

It looked good until today. Yesterday I added a 3ml/gal dose of calmag+ as a preventative for those deficiencies.
Would that have caused this in 24hrs?
Trying to figure out why this came up.
Thanks

I also have a fan running for air circulation and an inline fan/carbon filter.

Any ideas? I would like to correct this early.

No replies? Somebody has to have an idea.

RottyRzr said:

No replies? Somebody has to have an idea.

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Suspected Manganese deficiency.



This link may help.

Thanks lokie. I checked out the link you posted and it does kinda look like mag deficiency. Ive looked at several other sites and don't see anything that looks just like my leaves. Most say that mag deficiency starts in the lower leaves and on this plant the leaves affected are about mid plant.
Would supplementing with epsom salt alone be a good idea or should it be calmag so it also has calcium available?
I don't know why trying to grow cannabis is giving me such a hard time. This is an autoflower and so are the other plants that Ive had trouble with. I have 1 photoperiod plant growing that looks wonderful. Are autoflowers more susceptible to problems?

Couple questions. What are you PHing your water to and how big are your pots? Depending on pot size, it might actually be better to feed a lower PPM, like 600, but do it twice per day. Feeding more frequently in coco (to plenty of runoff) helps maintain a stable PH in the correct range. Does canna a&b even have micronutrients? I couldn't find an ingredient list for those products after a quick search, which I hate.

I ph to 5.8 for the coco. The plant is in a 3 gallon smart pot.
I have looked online for the "guaranteed analysis" for Canna's nutes and cant find anything. The back of the bottles list the NPK, calcium, magnesium and molybdenum. That's all I see listed. I can post a pic of the back of the bottles if you want.
Ive read nothing but good stuff about Canna's line of nutes but it is kinda strange they don't show more micronutrients.

Back of bottles.

RottyRzr said:

I ph to 5.8 for the coco. The plant is in a 3 gallon smart pot.
I have looked online for the "guaranteed analysis" for Canna's nutes and cant find anything. The back of the bottles list the NPK, calcium, magnesium and molybdenum. That's all I see listed. I can post a pic of the back of the bottles if you want.
Ive read nothing but good stuff about Canna's line of nutes but it is kinda strange they don't show more micronutrients.

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I'm not surprised, i always thought it weird that Maxibloom only has iron and molybdenum too. I think certain micros are more "essential" than others. One last question, what is your base water like, is the PH quite high to start with? If the problem is micronutrients, you could get some Bioag tm-7 and dose your plants with it about twice per grow, it doesn't take much and that covers all the micros-I use that with maxibloom.

As long as the roots have filled out your pot, you can feel free to experiment with multi-feeding at a lower PPM solution. Twice per day is pretty tolerable without automating the process and I think you'll find great success with it.

RottyRzr said:

Back of bottles.

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I've never used Canna, but it does look like it could be the lack of micronutrients causing your issue. I find those labels odd. So sulfur source either, very peculiar. I would also consider adding some epsom salts to your feed.

Rurumo said:

One last question, what is your base water like, is the PH quite high to start with?

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I have well water. The ppm varies all the time. I don't know why. Maybe due to rain? Anyway, it was 155ppm a couple weeks ago and I checked it yesterday and it was 100ppm. (Im actually sending a sample off tomorrow to find out what's in my water) The ph of the water varies also but is always acidic and I have to add ph up to adjust after adding nutes. I had to re-plumb the house several years ago due to the copper pipes getting pin holes. Other folks in this area have done the same, switching out their copper for pex.

I have Apera PH60 and EC60 pens. Calibrated so I assume they are correct.

I use well water also except I'm on the other end being too alkaline. Two questions, did the splotches appear over night since adding the calmag? Have you done a water analysis? If your feeding and using well water you could be multiplying certain nutrients which would overfeed certain nutrients causing weird leaf problems.

You added calmag and this happened the next day? If so feed with lower ppm and no calmag to flush out excess Ca.If improvement it was Ca tox.

sonnyjim said:

I use well water also except I'm on the other end being too alkaline. Two questions, did the splotches appear over night since adding the calmag? Have you done a water analysis? If your feeding and using well water you could be multiplying certain nutrients which would overfeed certain nutrients causing weird leaf problems.

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I think the splotches appeared overnight. Im in there everyday and look things over pretty well.
I mentioned in my reply above that Im actually sending off a water sample tomorrow. I had one ready to go today and forgot about it being a holiday so I'll get a fresh sample in the morning.

myke said:

You added calmag and this happened the next day? If so feed with lower ppm and no calmag to flush out excess Ca.If improvement it was Ca tox.

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Yep. Im 99% sure there were no weird looking leaves before adding the calmag. This plant has been looking very healthy and I was accrediting it to the Canna nutes. Maybe I screwed that up with the calmag huh?

RottyRzr said:

Yep. Im 99% sure there were no weird looking leaves before adding the calmag. This plant has been looking very healthy and I was accrediting it to the Canna nutes. Maybe I screwed that up with the calmag huh?

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Is EC of runoff close to input EC?

myke said:

Is EC of runoff close to input EC?

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I haven't checked the runoff ec in a while. Things were looking so good I didnt think there was a need. I will check it later when I feed it.