Need help diagnosing this deficiency. Plants are in flower. Looks to be affecting top leaves first and working way down.
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Calmag deficiency most likely. Itll look like nutrient burn but thats because the plants robbing paul to pay peter. Are you adding calmag to your watering schedule?
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Not so sure my brother @Ebb that looks like a basic N toxicity.
@Abarnett88 what specifically Have you supplemented so far?
What medium?
And how are your pH habits?
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Agree with @PurpNGold74 some toxicity can resemble deficiencies. Do you have any input and run off numbers for us 
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Can we see pic of whole plant? We love plentiful pics of pot porn.
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I attached two pics of two plants showing these symptoms. Should have provided more details. Ocean Forest soil, Jacks 321 nutrients.
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Those tell the story much better. Yup slightly too much N. And possibly too little P. She’s in flower (and that light… looks great) so her PK requirements are probably skyhigh right now
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Any recommendations for any PK products? I have only been using Jacks 321. I assume that I mix in PK with my Jack’s?
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GH liquid koolbloom or Canna PK 13/14 would probably be best this far into flowering. Greenleaf Nutrients makes a cheap PK booster for all stages of flowering that looks interesting. Price definitely looks good, but I haven’t used it so idk about the quality. Early flowering try some MKP or big bud with Jack’s next grow.
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One of the Jacks’ amendments is PK leaning. I think its part A.
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Correct
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Let’s get some information about your grow environment, please.
A support ticket will help us help you. Can you please fill out a support ticket? Please include what type of water you are using (RO, distilled, tap.)
COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non-applicable)
• What strain, Seed bank, or bag seed
• Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
Soil brand and type
• Vessels: Pots, Grow beds, Buckets, Troths
• PH of Water, Solution, runoff (if Applicable)
• PPM/TDS or EC of nutrient solution if applicable
• Indoor or Outdoor
• Light system
• Temps; Day, Night
• Humidity; Day, Night
• Ventilation system; Yes, No, Size
• AC, Humidifier, De-humidifier,
• Co2; Yes, No
If growing Hydro some additional questions:
-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution
Always try to upload a clear picture of any issues you may have to allow the community to assist you. Pictures taken under natural or white lighting are by far the best.
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Yes, it’s 5-12-26. I’ve seen videos of GreenGene just using 4/2/0 during flowering. Judging by his videos it works well for him.
Hey what works for some doesnt work for all. Id wager his soil is amended to work well with his supplements.
If you look at any of the major canna nutrient suppliers, ull see an obvious trend in their main lineups and schedules.
Veg feeds are some kind of ‘grow’ and always are heavy Nitrogen, lower Potassium and Phosphorus.
Bloom/Flower feeds always slowly lower Nitrogen and increase P and K.
Those companies make millions and have plenty of research in it.
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