Cal-mag use and genetics

Hello folks
Looking for some input on cal-mag use. My first grow I had issues and after researching lots of grow journals I had decided to start amending my organic soil grows with 3ml cal-mag after lights hit 75% of expected high level.
This worked for 3 grows and 4 different strains.
Then I got a freebie seed called Gelato X Girl Scout Cookies.
This plant started a calcium issue 2 weeks ago and has stopped progressing after going to 5ml per gallon rate for 3 waterings.
Question is this. The strain mix of Gelato and Girl Scout Cookies had large calcium use and I am wondering if one or either of the strains is a high user and when I see strains with this specific lineage should I amend harder when I run them?

I would check runoff numbers to be sure it’s not a ph lockout first, then you could increase cal mag if numbers line up.:oncoming_fist: It’s pretty hard to have a calcium toxicity, possible but not likely. I ran it every feeding this grow and they seemed to like it in the Promix.

Organic soil organic nutrition ro water.
Not lockout. Not pH. Just a calcium lack during mid flower.
Just wondering if these strains have a propensity.

Not the best option because missing micros.


This is Zn def showing on back row.

Gypsum top dressings solves this and is organic, unlike calmag

Some plants are just Ca hogs and require way more. Amend harder or feed more? Amending would be gypsum and feeding is calmag. Either way, double the Ca once transition starts.

Ca def spots shows 2 wks after becoming deficient. Assuming wk5 (half way) you went deficient at wk3 during the start of high demands. Thats quite common to see on the forum and doesn’t necessarily indicate the plants is a Ca hog; just under fed for stage availability demands.

The " ai" or LLM system has a few things wrong.
I did not state the increase in cal-mag did not cure the issue. Moving to 5lm stopped the spread. I was interested in knowing if there were certain strains that used calcium heavy.
I did not state this in the post but I use Dr Earth Organics on the heavy feed schedule and the micros are in the 4 part system.
The statement of a zinc issue I have no clue. The back row is the last widow less than 10 days from chop and has stopped drinking much and still plumping up flowers. The fade stated early on this one but has not touched the flowers.
First run using the Dr Earth schedule. Some early over nutrition issues have me slowing the feed during week 4 and picking it back up 2 weeks into flower. In addition I did learn the need to reduce the feed rate when reducing vegitation such as mainlining a plant. It sounds completely obvious now but the 9 week veg to set up the tops I stupidly kept shoveling that stuff in.
Awell. Nice to learn as we grow.

Calcium tox is not a thing but the same sites that uptake other nutrients can be overused causing a general def for all nutrients.
I have no plan on seeing what that number is…

After reviewing some notes I think that I am off on this one.

The mainline plants have been alive way to long. The setup ( my first ) went fine until the 3rd step for the tops 5678. Then the plants slowed and took a long time to finally get some hight. The whole time every 2 weeks I am shoveling in the bloom bag.
3 9 4
I now think the nutrition load had a huge amount of potassium and this nutrition is one of the 3 ( C MG and K ) that share root zones for exchanging. I think it is a better possibility that the high levels of K caused the calcium issue.

You can have too much of anything.

Fascinating :face_with_monocle: discussion

You calling me an AI? I’m completely real with a body. I just know my stuff, and organics is my jam. Thats why I get called in to diagnose plant issues. You added calmag and it stopped. You filled the hole of missing Ca with calmag.

Yes ie sour diesel

Me too. Just not from a feed schedule, because I read the plants and know stage demands by week. I use it as a base with known numbers then add what is needed for next stage in advance.


Zn def shown in this pic. It’s easily spotted. It was just an observation and I saw using RO that has none.

Nutrient excess is a thing and causes lock outs. Call it toxicity if you want.

If that were the case, you’d see other signs as well, like -P. I add more K to the (4) Dr Earth amend using langbenite 0-0-22 in transition and again wk5-6 for finishing strong.

Thx for the feedback. I have been curious how others dealt with the buildup on longer runs and P has always been way higher than most other organic dry top feeds.
With my 5th grow running I do not have enough experience on this nutrition other than fish shit and the 1 1 1 feed fro Dr Earth.
The AI comment was directed at the clearly marked generated by AI synopsis at the end of the thread not you.

I am a couple of days from my first dress for the newbies. Going to do a 100% feed of the Homegrown but based on a 3 gallon pot size not 5 that is in the chart.
Widow has had its last feed and the Gelato is in poor shape.
Mini blackberry moonrocks plants hanging in.

I added to mine @Big123 if ya wanna save

Yes I have that pinned like VPD charts and all the fade photos.

I had a lot better run during 2 and 3 when I took good pics and studied the changes and made adjustments to VPD and such but with 1 heater and 2 humidity boxes out of the tent I pretty much got what I got right now.

Toss up your chart. I’ve never seen or looked for one. I’ll have a look at it.

If you wanna breakdown of stage demands by weeks


Remember to amend 2 wks before demand begins.

Yeah that doesn’t look right for cannabis. It does sell many products.

Yes that’s why they have you dress every 2 weeks but amend with the 1 1 1 anytime as needed.
Now imagine an excessively long veg for a mainline and you keep feeding the pot and feeding the pot. Pkh it looked great just slow and then stalled. Fixed it 2 times with fish shit and cal-mag but it would catch up again. What a Trainwreck.
Widows ran normal 2/3/9 seed veg and flower and had minimal problems

I think the mains were 2/9/9 right now.