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How do I mix Jack's 321?

Writer: jacksnutrients
jacksnutrients
Mar 30, 2020
1 min read

We get a lot of questions asking about how to properly mix our Jack's 321 program (and how to know if something isn't mixed properly). Our very own "Wild Bill" Cody is here to give you the definitive mixing lesson straight from the JR Peters Laboratory.


Our Jack's 321 program is here to help you get your grow operation performing at optimum levels. To further dial in your hemp, cannabis, or other controlled environment crops check out our grow schedules page.


And Remember It's:

- 3.6 grams/gallon Part A (5-12-26) and dissolve then add

- 1.1 grams/gallon Epsom Salts and dissolve completely then add

- 2.4 grams/gallon Part B (Calcium Nitrate)

15 Comments


sergio modric
Aug 25

Great resource for anyone who wants a straightforward explanation of the Jack’s 321 mixing process. Breaking down the order of Part A, Epsom salts, and Part B makes the instructions much easier to follow, especially for growers troubleshooting their nutrient routine. I Microsoft Azure Consulting Services recently noticed in a related discussion, and I appreciate how clearly this post focuses on practical information.

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Dave Elias
Dave Elias
Feb 26

What EC should I be getting each stage?

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John Tefft
John Tefft
Mar 17, 2024

I put 1/2 gallon of warm water and put it in a jug. I then weigh out my ratios for how many gallons are in my system's of part A, epsom salts and Part B. Part A first then I hit it with the drill with the epoxy mixer attachment. It mixes super fast and thoroughly. I then add the epsom salt ratio per gallon for my system, mix then part B and mix. I put it in the reservoir and check numbers after an hour.


Numbers look good after application

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Unknown member
Mar 18, 2024
Replying to

That's a great way of doing it!

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Alexander Carrillo
Alexander Carrillo
Feb 19, 2024

Once my solutions mixed. (In the correct order). My ph sits around 6.8.

Should I add ph down at this point? Would that cause any ill effects. I’m trying for 6.0 ph. I’m also growing in coco

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Chase Lambert
Chase Lambert
Aug 29, 2023

why is my solution a red color sometimes and a clearer green other times? What could be going wrong here?

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mday
Aug 30, 2023
Replying to

Chase, saw that Brett got back to you via email, but thought I would share his answers here so others could see if they have the same questions.


The color of our Part A tends to vary a bit depending on the batch because of all the chelated micronutrients. Some batches of iron we receive can be a little darker in solution that others and sometimes that shows in the mixed product.

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